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Journal articles on the topic 'Unsteady gas dynamics'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

JOULIN, GUY, HAZEM EL-RABII, and KIRILI A. KAZAKOV. "On-shell description of unsteady flames." Journal of Fluid Mechanics 608 (July 11, 2008): 217–42. http://dx.doi.org/10.1017/s0022112008002140.

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The problem of a non-perturbative description of unsteady premixed flames with arbitrary gas expansion is addressed in the two-dimensional case. Considering the flame as a surface of discontinuity with arbitrary local burning rate and gas velocity jumps, we show that the flame-front dynamics can be determined without having to solve the flow equations in the bulk. On the basis of the Thomson circulation theorem, an implicit integral representation of the downstream gas velocity is constructed. It is then simplified by a successive stripping of the potential contributions to obtain an explicit

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2

Rylov, A. I. "A variational problem in one-dimensional unsteady gas dynamics." Fluid Dynamics 19, no. 4 (1985): 667–71. http://dx.doi.org/10.1007/bf01091098.

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Zhao, Y., and D. E. Winterbone. "A Study of Multi-Dimensional Gas Flow in Engine Manifolds." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 208, no. 2 (1994): 139–45. http://dx.doi.org/10.1243/pime_proc_1994_208_172_02.

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In this study, a three-dimensional Navier—Stokes solver was developed based on the finite volume fluid-in-cell (FVFLIC) method. The objective was to develop a comprehensive engine simulation tool that could predict unsteady flow features in the engine manifold and gas dynamic interaction between the intake system and the engine. Therefore the geometry effect of the manifold on gas dynamics could be fully investigated and later utilized in manifold design. Being shown here are some of the latest results of the research work aiming to validate the simulation program and apply it to the analysis

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4

Wu, Junlin, Zhihui Li, Aoping Peng, and Xinyu Jiang. "Numerical Simulations of Unsteady Flows From Rarefied Transition to Continuum Using Gas-Kinetic Unified Algorithm." Advances in Applied Mathematics and Mechanics 7, no. 5 (2015): 569–96. http://dx.doi.org/10.4208/aamm.2014.m523.

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AbstractNumerical simulations of unsteady gas flows are studied on the basis of Gas-Kinetic Unified Algorithm (GKUA) from rarefied transition to continuum flow regimes. Several typical examples are adopted. An unsteady flow solver is developed by solving the Boltzmann model equations, including the Shakhov model and the Rykov model etc. The Rykov kinetic equation involving the effect of rotational energy can be transformed into two kinetic governing equations with inelastic and elastic collisions by integrating the molecular velocity distribution function with the weight factor on the energy o

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Yuri, Bykov. "DEVELOPMENT OF IMPLICIT METHOD FOR NUMERICAL MODELING OF TURBOMACHINE BLADE THERMOELASTIC VIBRATIONS." Technology audit and production reserves 5, no. 1 (49) (2019): 41–44. https://doi.org/10.15587/2312-8372.2019.184169.

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<em>There was a tendency in recent decades to increase the combustion temperature in gas-turbine engines (GTE). This allows increasing both the efficiency of the engine and the output power. In modern engines, the temperature of the exhaust gas is already significantly higher than the melting temperature of blade material. In this regard, in the design of GTE turbines there is a need to use numerical methods that allow the most reliable modeling of unsteady aerothermoelastic effects. One of the components of the aerothermoelastic problem is to integrate the unsteady equations of thermoelastici

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Chen, Shifu, Hong Lei, Meng Wang, Changyou Ding, Weixue Dou, and Lishan Chang. "Turbulent flow with nonequilibrium chemical reaction in single snorkel RH." International Journal of Numerical Methods for Heat & Fluid Flow 31, no. 8 (2021): 2715–32. http://dx.doi.org/10.1108/hff-08-2020-0535.

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Purpose The reported mathematical models of gas–liquid flow in single snorkel Rheinstahl–Heraeus (SSRH) are based on the assumption of steady Ar-molten steel flow. The purpose of this paper is to develop a mathematical model to describe the unsteady turbulent flow (CO-Ar-molten steel) with nonequilibrium decarburization reaction. Design/methodology/approach On the base of the finite volume method, the computational fluid dynamics software CFX is used to predict the unsteady fluid flow, the spatial distributions of CO/argon gas and carbon element. The water model experiment and the industrial e

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Perotti, M. "Speed-up of a DFEM code for unsteady gas dynamics in pipes." International Journal of Mechanical Sciences 41, no. 7 (1999): 793–813. http://dx.doi.org/10.1016/s0020-7403(98)00062-9.

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Liu, Jian-Hong, Fu-Min Shang, and Wei Qiao. "Numerical Simulation on Flow and Heat Transfer in Pulsating Heat Pipe with Different Models." E3S Web of Conferences 165 (2020): 01031. http://dx.doi.org/10.1051/e3sconf/202016501031.

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Based on Mixture and Euler model, numerical simulation was used to study the flow and heat transfer in pulsating heat pipe by unsteady method. By comparing the gas volume fraction and gas velocity by different models at different time, the results showed that both models could simulate the evaporation and condensation process of the working fluid, and the liquid plug and gas plug were formed in the tube. By comparing the gas volume fraction and gas velocity at 5s and 10s, it was indicated that the fluid dynamics and heat transfer were more violent by Mixture model in the tube.

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Khan, Hassan, Saeed Islam, and Muhammad Arif. "The Fractional View Analysis of Polytropic Gas, Unsteady Flow System." Mathematical Problems in Engineering 2021 (February 11, 2021): 1–17. http://dx.doi.org/10.1155/2021/5130136.

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Generally, the differential equations of integer order do not properly model various phenomena in different areas of science and engineering as compared to differential equations of fractional order. The fractional-order differential equations provide the useful dynamics of the physical system and thus provide the innovative and effective information about the given physical system. Keeping in view the above properties of fractional calculus, the present article is related to the analytical solution of the time-fractional system of equations which describe the unsteady flow of polytropic gas d

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10

Plotnikov, L. V., Y. M. Brodov, B. P. Zhilkin, and N. I. Grigoriev. "Features of heat and mechanical characteristics of pulsating flows in gas-air paths of piston engines with turbocharging." Power engineering: research, equipment, technology 21, no. 4 (2019): 77–84. http://dx.doi.org/10.30724/1998-9903-2019-21-4-77-84.

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This article provides a comparative analysis of unsteady gas dynamics and instantaneous local heat transfer of pulsating flows in the intake and exhaust systems of reciprocating internal combustion engines in the case of a turbo-compressor installed without it and based on the results of experimental studies. Experimental studies were carried out on full-scale laboratory stands under the conditions of gas-dynamic nonstationarity. The article provides an original method for determining the instantaneous values of the local heat transfer coefficient in pipes, and describes the procedure for cond

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11

Jain, Nishan, Luis Bravo, Dokyun Kim, et al. "Massively Parallel Large Eddy Simulation of Rotating Turbomachinery for Variable Speed Gas Turbine Engine Operation." Energies 13, no. 3 (2020): 703. http://dx.doi.org/10.3390/en13030703.

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Gas turbine engines are required to operate at both design and off-design conditions that can lead to strongly unsteady flow-fields and aerodynamic losses severely impacting performance. Addressing this problem requires effective use of computational fluid dynamics tools and emerging models that resolve the large scale fields in detail while accurately modeling the under-resolved scale dynamics. The objective of the current study is to conduct massively parallel large eddy simulations (LES) of rotating turbomachinery that handle the near-wall dynamics using accurate wall models at relevant ope

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Vladov, Serhii, Arkadiusz Banasik, Anatoliy Sachenko, et al. "Intelligent Method of Identifying the Nonlinear Dynamic Model for Helicopter Turboshaft Engines." Sensors 24, no. 19 (2024): 6488. http://dx.doi.org/10.3390/s24196488.

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This research focused on the helicopter turboshaft engine dynamic model, identifying task solving in unsteady and transient modes (engine starting and acceleration) based on sensor data. It is known that about 85% of helicopter turboshaft engines operate in steady-state modes, while only around 15% operate in unsteady and transient modes. Therefore, developing dynamic multi-mode models that account for engine behavior during these modes is a critical scientific and practical task. The dynamic model for starting and acceleration modes has been further developed using on-board parameters recorde

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Denisikhin, Sergey, Vladislav Emelyanov, and Konstantin Volkov. "Fluid Dynamics of Thrust Vectorable Submerged Nozzle." Fluids 6, no. 8 (2021): 278. http://dx.doi.org/10.3390/fluids6080278.

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A numerical simulation of the gas-dynamic processes in the thrust vectorable nozzle of the solid rocket motor is considered. Construction of a geometric model and a generation of computational mesh, and reconstruction of model and mesh at each time step are discussed. Calculations of the flowfield of combustion products in the pre-nozzle chamber and nozzle block are carried out for various angles of nozzle rotation. The distributions of the gas dynamic quantities in the pre-nozzle volume corresponding to the outflow of the combustion products from the cylindrical channel and star-shaped channe

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Elcner, Jakub, and Miroslav Jicha. "Effect of Multiple Liquid Inlets on Mass Transfer in Rotating Packed Beds." MATEC Web of Conferences 328 (2020): 02010. http://dx.doi.org/10.1051/matecconf/202032802010.

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This study deals with optimalization of rotating packed bed design using computational fluid dynamics approach. Comparison of three variants of liquid distributor were performed on 2D geometry. Turbulence was modelled using unsteady RANS approach and volume of fluid technique were used to simulate gas-liquid interphase. Results were compared on basis of liquid holdup evaluation.

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Fukunaga, Masataka, and Makoto Tosa. "Dynamics of a Self-Gravitating Gas Disk in an Ovally Distorted Gravitational Potential." Publications of the Astronomical Society of Japan 43, no. 3 (1991): 469–84. https://doi.org/10.1093/pasj/43.3.469.

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Abstract The dynamical behavior of a self-gravitating gaseous disk is studied in the central region of a galaxy in response to a fixed, ovally distorted gravitational potential. The gas disk is modeled as an ensemble of inelastically interacting gas clouds and followed using an N-body simulation. To observe the behavior of gas near the center we simulate gas flow within a few turn-over-radii of the rotation curve. The gas accumulates and forms an oval ring at the turnover radius, where the rotation curve switches from an inner rigid type to an outer differential type. As the self-gravitation o

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Morozov, A. A., and V. A. Titarev. "Dynamics of planar gas expansion during nanosecond laser evaporation into a low-pressure background gas." Physics of Fluids 34, no. 9 (2022): 096101. http://dx.doi.org/10.1063/5.0101119.

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A numerical study in a one-dimensional planar formulation of the dynamics of the neutral gas expansion during nanosecond laser evaporation into a low-pressure background gas is carried out using two different kinetic approaches: the direct simulation Monte Carlo method and direct numerical solution of the Bhatnagar–Gross–Krook equation. Results were obtained for a wide range of parameters: the background gas pressure, masses of evaporated and background particles, temperature and pressure of saturated vapor on the evaporation surface, and evaporation duration. They are in good agreement with t

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17

Han, Fenghui, Qingyuan Lan, Yuxiang Liu, et al. "Unveiling Turbulent Flow Dynamics in Blind-Tee Pipelines: Enhancing Fluid Mixing in Subsea Pipeline Systems." Journal of Marine Science and Engineering 12, no. 7 (2024): 1199. http://dx.doi.org/10.3390/jmse12071199.

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Blind tees, as important junctions, are widely used in offshore oil and gas transportation systems to improve mixing flow conditions and measurement accuracies in curved pipes. Despite the significance of blind tees, their unsteady flow characteristics and mixing mechanisms in turbulent flow regimes are not clearly established. Therefore, in this study, Unsteady Reynolds-Averaged Navier–Stokes (URANS) simulations, coupled with Explicit Algebraic Reynolds Stress Model (EARSM), are employed to explore the complex turbulent flow characteristics within blind-tee pipes. Firstly, the statistical flo

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18

Harding, Edward M., Emily J. Berg, and Risa J. Robinson. "Diffusion in Replica Healthy and Emphysematous Alveolar Models Using Computational Fluid Dynamics." ISRN Biomedical Engineering 2013 (June 3, 2013): 1–9. http://dx.doi.org/10.1155/2013/919802.

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Deposition of nanosized particles in the pulmonary region has the potential of crossing the blood-gas barrier. Experimental in vivo studies have used micron-sized particles, and therefore nanoparticle deposition in the pulmonary region is not well understood. Furthermore, little attention has been paid to the emphysematous lungs, which have characteristics quite different from the healthy lung. Healthy and emphysematous replica acinus models were created from healthy and diseased human lung casts using three-dimensional reconstruction. Particle concentration and deposition were determined by s

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19

Adami, P., and F. Martelli. "Three-dimensional unsteady investigation of HP turbine stages." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 220, no. 2 (2006): 155–67. http://dx.doi.org/10.1243/095765005x69189.

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This article deals with a three-dimensional unsteady numerical simulation of the unsteady rotor—stator interaction in a HP turbine stage. The numerical approach consists of a computational fluid dynamics (CFD) parallel code, based on an upwind total variation diminishing finite volume approach. The computation has been carried out using a sliding plane approach with hybrid unstructured meshes and a two-equation turbulent closure. The turbine rig under investigation is representative of the first stage of aeronautic gas turbine engines. A brief description of the cascade, the experimental setup

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20

Cui, Zhen Min. "Study on Temperature Distribution of a Honeycomb Regenerator during Preheating Process." Applied Mechanics and Materials 170-173 (May 2012): 2699–702. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2699.

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The HiTAC technology (High Temperature Air Combustion) is a reliable, industry proven combustion method. A three-dimensional numerical model is established which is for unsteady preheating process in honeycomb regenerator. The preheating period of honeycomb was simulated by means of computational fluid dynamics (CFD) software; the outlet temperature, temperature at lengthways of gas, and temperature at lengthways of honeycomb were obtained.

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21

Rossano, Viola, and Giuliano De Stefano. "Hybrid VOF–Lagrangian CFD Modeling of Droplet Aerobreakup." Applied Sciences 12, no. 16 (2022): 8302. http://dx.doi.org/10.3390/app12168302.

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A hybrid VOF–Lagrangian method for simulating the aerodynamic breakup of liquid droplets induced by a traveling shock wave is proposed and tested. The droplet deformation and fragmentation, together with the subsequent mist development, are predicted by using a fully three-dimensional computational fluid dynamics model following the unsteady Reynolds-averaged Navier–Stokes approach. The main characteristics of the aerobreakup process under the shear-induced entrainment regime are effectively reproduced by employing the scale-adaptive simulation method for unsteady turbulent flows. The hybrid t

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22

Yoshizawa, K., K. Mori, K. Arai, and A. Iiyama. "Numerical Analysis of Unsteady Exhaust Gas Flow and Its Application for Lambda Control Improvement." Journal of Engineering for Gas Turbines and Power 125, no. 2 (2003): 555–62. http://dx.doi.org/10.1115/1.1473149.

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A multidimensional computational fluid dynamics (CFD) tool has been applied to analyze the exhaust system of a gasoline engine. Since gas flow in the exhaust manifold is affected by exhaust pulsations, prediction methods based on steady flow are not able to predict gas flow precisely enough. Therefore, a new multidimensional calculation method, called pulsation flow calculation, has been developed. A one-dimensional gas exchange simulation and a three-dimensional exhaust gas flow calculation are combined to simulate gas flow pulsations caused by the gas exchange process. Predicted gas flow in

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23

Plotnikov, Leonid. "A Thermal Anemometry Method for Studying the Unsteady Gas Dynamics of Pipe Flows: Development, Modernisation, and Application." Sensors 23, no. 24 (2023): 9750. http://dx.doi.org/10.3390/s23249750.

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A detailed study of the gas-dynamic behaviour of both liquid and gas flows is urgently required for a variety of technical and process design applications. This article provides an overview of the application and an improvement to thermal anemometry methods and tools. The principle and advantages of a hot-wire anemometer operating according to the constant-temperature method are described. An original electronic circuit for a constant-temperature hot-wire anemometer with a filament protection unit is proposed for measuring the instantaneous velocity values of both stationary and pulsating gas

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24

Zhou, Shuang-Shuang, Nehad Ali Shah, Ioannis Dassios, S. Saleem, and Kamsing Nonlaopon. "A Comparative Analysis of Fractional-Order Gas Dynamics Equations via Analytical Techniques." Mathematics 9, no. 15 (2021): 1735. http://dx.doi.org/10.3390/math9151735.

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This article introduces two well-known computational techniques for solving the time-fractional system of nonlinear equations of unsteady flow of a polytropic gas. The methods suggested are the modified forms of the variational iteration method and the homotopy perturbation method by the Elzaki transformation. Furthermore, an illustrative scheme is introduced to verify the accuracy of the available techniques. A graphical representation of the exact and derived results is presented to show the reliability of the suggested approaches. It is also shown that the findings of the current methodolog

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Plotnikov, Leonid V., Oleg V. Komarov, Danil A. Davydov, Dmitriy N. Krasilnikov, and Vladislav A. Shurupov. "Features of non-stationary thermal mechanical processes in the exhaust manifold of an automobile piston engine of size 8.2/7.1." Transport of the Urals, no. 2 (2024): 49–55. http://dx.doi.org/10.20291/1815-9400-2024-2-49-55.

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The purpose of this work was to obtain experimental data on unsteady gas dynamics and the intensity of heat transfer of the flow in the exhaust system of an automobile piston engine for different initial conditions. The research was carried out on an experimental stand simulating the exhaust process in a piston engine in dynamics. The pressure at the outlet (in the cylinder) varied from 0.05 to 0.2 MPa, the speed of rotation of the crankshaft - from 600 to 3000 min-1. The method of thermal anemometry was used to determine the gas dynamic, flow and heat exchange characteristics of the flow in t

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Zhang, Liang, Jiawei Zhou, and Honggang He. "Modeling and Simulation of Pigging for a Gas Pipeline Using a Bypass Pig." Mathematical Problems in Engineering 2020 (July 15, 2020): 1–12. http://dx.doi.org/10.1155/2020/2047352.

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The pipeline inspection gauge (PIG, lowercase pig is commonly used) with a bypass valve is widely used in pipeline inspection because it operates at a low speed without reducing the flow rate. Understanding the dynamics of a bypass pig in a gas pipeline would contribute to the design of the pig and the control of pig speed. This paper deals with the dynamic model for the process of a bypass pig travelling through a hilly gas pipeline. The method of characteristics (MOC) is used to solve the equations of unsteady gas flow. The backward flow of the gas in the bypass valve and pipe is shown by a

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Cao, C., J. W. Chew, P. R. Millington, and S. I. Hogg. "Interaction of Rim Seal and Annulus Flows in an Axial Flow Turbine." Journal of Engineering for Gas Turbines and Power 126, no. 4 (2004): 786–93. http://dx.doi.org/10.1115/1.1772408.

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A combined computational fluid dynamics (CFD) and experimental study of interaction of main gas path and rim sealing flow is reported. The experiments were conducted on a two stage axial turbine and included pressure measurements for the cavity formed between the stage 2 rotor disk and the upstream diaphragm for two values of the diaphragm-to-rotor axial clearance. The pressure measurements indicate that ingestion of the highly swirling annulus flow leads to increased vortex strength within the cavity. This effect is particularly strong for the larger axial clearance. Results from a number of

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He, Ping, Nai Chao Chen, and Dan Mei Hu. "Study of Wake Characteristics of a Horizontal-Axis Wind Turbine within Two-Phase Flow." Key Engineering Materials 474-476 (April 2011): 811–15. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.811.

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The two-phase flow is addressed for the more accurate estimation of the wake characteristic for the horizontal-axis wind turbine operating in the complexly unsteady environmental states. The computational fluid dynamics (CFD) method is implemented for performing the three-dimensional wind turbine using the simulating software tool of FLUNT. Three types of environmental states, single-phase flow, liquid-gas flow and solid-gas flow, are performed for the comparison of velocity and pressure distribution to derive the specify feature for wind turbine within two-phase flow environmental state. The

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Bromnick, P. A., R. J. Pearson, and D. E. Winterbone. "Intercooler model for unsteady flows in engine manifolds." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 212, no. 2 (1998): 119–32. http://dx.doi.org/10.1243/0954407981525849.

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A model has been developed for intercoolers which are used to reduce the temperature of the charge air in turbocharged internal combustion engines. The detailed theory for the intercooler model is presented. The behaviour of the intercooler is characterized by the relationship between the number of transfer units ( NTU) and the effectiveness (ε) of the intercooler, which is assumed to be that of a cross-flow heat exchanger. The structure of the code used to implement the model is presented and the model is applied to simulate the gas dynamics in a medium-speed turbocharged and intercooled dies

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Lieuwen, Tim, and Keith McManus. "That Elusive Hum." Mechanical Engineering 124, no. 06 (2002): 53–55. http://dx.doi.org/10.1115/1.2002-jun-4.

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This article highlights about modern power turbines that have the highest operating efficiencies. These turbines turn out the fewest pollutants among major combustion energy converting devices. In addition, they are attractive because of low capital costs required to bring new systems online. As a result, gas turbines have become the dominant technology for new power generating capacity in the United States and worldwide. Experimentalists have developed new diagnostic tools for making pertinent measurements in the unsteady, harsh combustor environment. In addition, computational advances in si

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Mel’nik, O. É. "An unsteady model for volcanic-eruption dynamics involving crystallization and through-magma gas filtration." Doklady Physics 46, no. 4 (2001): 271–75. http://dx.doi.org/10.1134/1.1371049.

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Kovačič, K., and B. Šarler. "The kinetic energy transfer analysis between the gas and the liquid in flow-focusing of the micro-jet." Journal of Physics: Conference Series 2766, no. 1 (2024): 012075. http://dx.doi.org/10.1088/1742-6596/2766/1/012075.

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Abstract The present study uses computational fluid dynamics to analyse the kinetic energy transfer from the gas to the liquid phase, considering the significant influence of surface tension. The considered situation is the gas dynamic virtual nozzle, where the co-flowing gas focuses and accelerates the liquid jet. The experimentally validated half-space three-dimensional gas-liquid mixture model addresses the unsteady, incompressible, isothermal, Newtonian, low-turbulent two-phase flow. The continuity, momentum and the k-ω SST turbulence model are employed to resolve the fluid flow. The numer

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Zhang, G. Q., and D. N. Assanis. "Manifold Gas Dynamics Modeling and Its Coupling With Single-Cylinder Engine Models Using Simulink." Journal of Engineering for Gas Turbines and Power 125, no. 2 (2003): 563–71. http://dx.doi.org/10.1115/1.1560708.

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A flexible model for computing one-dimensional, unsteady manifold gas dynamics in single-cylinder spark-ignition and diesel engines has been developed. The numerical method applies an explicit, finite volume formulation and a shock-capturing total variation diminishing scheme. The numerical model has been validated against the method of characteristics for valve flows without combustion prior to coupling with combustion engine simulations. The coupling of the gas-dynamics model with single-cylinder, spark-ignition and diesel engine modules is accomplished using the graphical MATLAB-SIMULINK en

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Chuprov, Ilya F., Alexander A. Lyutoev, and Maria S. Parmuzina. "The simulation of non-stationary gas pressure in a pipeline with pumping and injection." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 9, no. 2 (2023): 93–107. http://dx.doi.org/10.21684/2411-7978-2023-9-2-93-107.

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In this work, based on the fundamental research of I. A. Charny on the unsteady movement of a real fluid in pipes, an equation that describes the pressure dynamics in a complex section of a gas pipeline was compiled. The use of the Dirac impulse function made it possible to describe the dynamics of unsteady pressure in a single equation in the case of point pumping and injection at given points. Linearization of the model by averaging the velocity of the gas made it possible to bring the equation to a hyperbolic form. If we neglect the forces of inertia compared to the forces of resistance, th

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Farshchi, Mohammad, and Mohammad Hassan Rahimian. "Unsteady Deformation and Internal Circulation of a Liquid Drop in a Zero Gravity Uniform Flow." Journal of Fluids Engineering 121, no. 3 (1999): 665–72. http://dx.doi.org/10.1115/1.2823521.

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Numerical simulation of the internal and external flow fields of a liquid drop moving in the surrounding gas are considered. The present work is concerned with the time accurate numerical solution of a two phase flow field at the low Mach number limit with an appropriate volume tracking method to capture motion and deformation of a liquid drop. In particular, deformation of a liquid drop moving with a coflowing gas stream in a zero gravity field is simulated. The effects of the gas flow Reynolds number and drop Weber number on the deformation dynamics of the drop have been investigated. There

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Chen, K., and G. A. Karim. "Evaluation of the instantaneous unsteady heat transfer in a rapid compression-expansion machine." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 212, no. 5 (1998): 351–62. http://dx.doi.org/10.1243/0957650981536925.

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Investigation is made of the instantaneous unsteady heat transfer within a pneumatically driven rapid compression-expansion machine that offers simple, well-controlled and known boundary conditions. Values of the instantaneous apparent overall heat flux from the cylinder gas to the wall surfaces were calculated using a thermodynamic analysis of the experimentally measured pressure and volume temporal development. Corresponding heat flux values were also estimated through the application of a three-dimensional computational fluid dynamics code, KIVA3. Correlation of the derived data using the m

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Brookes, S. J., R. S. Cant, I. D. J. Dupere, and A. P. Dowling. "Computational Modeling of Self-Excited Combustion Instabilities." Journal of Engineering for Gas Turbines and Power 123, no. 2 (2001): 322–26. http://dx.doi.org/10.1115/1.1362662.

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It is well known that lean premixed combustion systems potentially offer better emissions performance than conventional non-premixed designs. However, premixed combustion systems are more susceptible to combustion instabilities than non-premixed systems. Combustion instabilities (large-scale oscillations in heat release and pressure) have a deleterious effect on equipment, and also tend to decrease combustion efficiency. Designing out combustion instabilities is a difficult process and, particularly if many large-scale experiments are required, also very costly. Computational fluid dynamics (C

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Singh, Brajesh K., Haci Mehmet Baskonus, Neetu Singh, Mukesh Gupta, and D. G. Prakasha. "Study of Time-Fractional Nonlinear Model Governing Unsteady Flow of Polytropic Gas." Axioms 12, no. 3 (2023): 285. http://dx.doi.org/10.3390/axioms12030285.

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The present study is concerned with studying the dynamical behavior of two space-dimensional nonlinear time-fractional models governing the unsteady-flow of polytropic-gas (in brief, pGas) that occurred in cosmology and astronomy. For this purpose, two efficient hybrid methods so-called optimal homotopy analysis J-transform method (OHAJTM) and J-variational iteration transform method (J-VITM) have been adopted. The OHAJTM is the hybrid method, where optimal-homotopy analysis method (OHAM) is utilized after implementing the properties of J-transform (JT), and in J-VITM is the J-transform-based

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Murata, Souichi. "New class of symmetries and exact solution to the unsteady equations of adiabatic gas dynamics." Chaos, Solitons & Fractals 24, no. 2 (2005): 579–82. http://dx.doi.org/10.1016/j.chaos.2004.09.086.

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Taheri, P., A. S. Rana, M. Torrilhon, and H. Struchtrup. "Macroscopic description of steady and unsteady rarefaction effects in boundary value problems of gas dynamics." Continuum Mechanics and Thermodynamics 21, no. 6 (2009): 423–43. http://dx.doi.org/10.1007/s00161-009-0115-3.

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Akmal, Husain, K. Singh V., and Aftab Haider Syed. "An Efficient Analytical Solution of Blast Wave Problem in Real Gas Flow under the Influence of Dust-Laden Particles." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 2490–94. https://doi.org/10.35940/ijeat.C5746.029320.

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In the present paper, we investigated the problem of the propagation of blast waves governed by a nonhomogeneous quasilinear hyperbolic system of partial differential equations (PDEs), describing one-dimensional unsteady motion with generalized geometries in a real gas flow (van der Waals gas) in which the influence of the dust particles is significant. An efficient analytical approach has been used to the governing hyperbolic system with respect to the Rankine-Hugoniot (RH) conditions to obtain an exact solution in terms of flow parameters density, velocity and the pressure, which exhibits sp

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Lin, Chao, Yunyi Wang, Ryozo Ooka, et al. "Modeling of street-scale pollutant dispersion by coupled simulation of chemical reaction, aerosol dynamics, and CFD." Atmospheric Chemistry and Physics 23, no. 2 (2023): 1421–36. http://dx.doi.org/10.5194/acp-23-1421-2023.

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Abstract. In the urban environment, gas and particles impose adverse impacts on the health of pedestrians. The conventional computational fluid dynamics (CFD) methods that regard pollutants as passive scalars cannot reproduce the formation of secondary pollutants and lead to uncertain prediction. In this study, SSH-aerosol, a modular box model that simulates the evolution of gas, primary and secondary aerosols, is coupled with the CFD software, OpenFOAM and Code_Saturne. The transient dispersion of pollutants emitted from traffic in a street canyon is simulated using the unsteady Reynolds-aver

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Jessop, D. E., A. J. Hogg, M. A. Gilbertson, and C. Schoof. "Steady and unsteady fluidised granular flows down slopes." Journal of Fluid Mechanics 827 (August 18, 2017): 67–120. http://dx.doi.org/10.1017/jfm.2017.458.

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Fluidisation is the process by which the weight of a bed of particles is supported by a gas flow passing through it from below. When fluidised materials flow down an incline, the dynamics of the motion differs from their non-fluidised counterparts because the granular agitation is no longer required to support the weight of the flowing layer. Instead, the weight is borne by the imposed gas flow and this leads to a greatly increased flow mobility. In this paper, a framework is developed to model this two-phase motion by incorporating a kinetic theory description for the particulate stresses gen

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Shivamoggi, Bhimsen K. "Potential Flow Theory Formulation of Parker’s Unsteady Solar Wind Model and Nonlinear Stability of Parker’s Steady Solar Wind Solution." Astrophysical Journal 985, no. 1 (2025): 3. https://doi.org/10.3847/1538-4357/adcd64.

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Abstract The purpose of this paper is to present a novel optimal theoretical framework based on potential flow theory in ideal gas dynamics, which provides a smooth extrapolation of Parker’s steady solar wind model to the unsteady case. The viability of this framework is illustrated by providing the first ever systematic theoretical formulation to successfully address the long-standing open issue of regularization of the singularity associated with the Parker sonic critical point (where the solar wind flow velocity equals the speed of sound in the gas) in the linear stability problem of Parker

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Gao, Feng, Yanfeng Li, Zhihe Su, Chunlin Wang, Haidong Wang, and Junmei Li. "Optimal human respiratory simulation for exhaled gas based on CFD method." PLOS ONE 19, no. 11 (2024): e0313522. http://dx.doi.org/10.1371/journal.pone.0313522.

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Human breathing is crucial for studying indoor environments and human health. Computational Fluid Dynamics (CFD) is a key tool for simulating human respiration. To enhance the accuracy of CFD simulations and reduce computation time, a new simulation strategy for human respiration is proposed in this paper. The effects of steady versus unsteady boundary conditions on simulation results were examined. For the unsteady boundary, sinusoidal exhalation velocities and non-inhalation gas were assumed, while the steady boundary involved constant velocities during both exhalation and inhalation phases.

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Chuprov, I. F., M. S. Parmuzina, and A. A. Lyutoev. "Modelling pressure dynamics in a gas pipeline with an in-line sampling." Oil and Gas Studies, no. 5 (October 20, 2024): 104–16. http://dx.doi.org/10.31660/0445-0108-2024-5-104-116.

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Gas pipelines, whether main, field, or urban, often operate in non-stationary modes. Changes in the operating modes of pumping stations, equipment start-up and shutdown, an in-line sampling or pumping and various factors are causes of instability of pressure, velocity, gas flow rate. Main pipelines are complex engineering systems with the pipeline itself being the main element. Fail-safety is the major factor in the operation of this system. Ensuring operational safety requires studying the movement regimes of the transported medium, particularly study of the dynamics of pressure duringstart-u

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Payri, R., R. Novella, M. Carreres, and M. Belmar-Gil. "Modeling gaseous non-reactive flow in a lean direct injection gas turbine combustor through an advanced mesh control strategy." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 11 (2020): 1788–810. http://dx.doi.org/10.1177/0954410020919619.

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Fuel efficiency improvement and harmful emissions reduction are the main motivations for the development of gas turbine combustors. Numerical computational fluid dynamics (CFD) simulations of these devices are usually computationally expensive since they imply a multi-scale problem. In this work, gaseous non-reactive unsteady Reynolds-Averaged Navier–Stokes and large eddy simulations of a gaseous-fueled radial-swirled lean direct injection combustor have been carried out through CONVERGE™ CFD code by solving the complete inlet flow path through the swirl vanes and the combustor. The geometry c

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Go¨ttlich, E., F. Neumayer, J. Woisetschla¨ger, W. Sanz, and F. Heitmeir. "Investigation of Stator-Rotor Interaction in a Transonic Turbine Stage Using Laser Doppler Velocimetry and Pneumatic Probes." Journal of Turbomachinery 126, no. 2 (2004): 297–305. http://dx.doi.org/10.1115/1.1649745.

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The current paper presents steady and unsteady flow data of a transonic test turbine stage operating under flow conditions similar to modern highly loaded gas turbines. Measurements were performed between stator and rotor as well as downstream of the rotor in planes perpendicular to the rotor axis. Time-resolved axial and tangential velocities were measured by a two-component laser doppler velocimeter (LDV) to investigate unsteady phenomena, while time-averaged flow properties were measured by means of a pneumatic seven-hole probe for all three spatial directions. The time-resolved investigati

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Azarova, Olga, and Oleg Kravchenko. "Principles of Unsteady High-Speed Flow Control Using a Time-Limited Thermally Stratified Energy Source." Fluids 7, no. 10 (2022): 326. http://dx.doi.org/10.3390/fluids7100326.

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This study focused on the development of the unsteady impact of a thermally stratified energy source on a supersonic flow around an aerodynamic (AD) body in a viscous heat-conducting gas (air). Research was based on the Navier-Stokes equations. The freestream Mach number was 2. A new multi-vortex mechanism of the impact of a time-limited stratified energy source on the aerodynamic characteristics of a body was described. Almost complete destruction of the bow shock wave in the density field, due to the multiple generation of Richtmyer-Meshkov instabilities in the region of a stratified energy

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Lukianov, Pavlo, and Kateryna Pavlova. "Unsteady flow of bubble liquid in hydraulic systems of aircraft and helicopters." Aerospace Technic and Technology, no. 2 (April 18, 2024): 4–14. http://dx.doi.org/10.32620/aktt.2024.2.01.

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The subject of this work is the phenomenon of a water hammer in a liquid that contains a small volume of gas bubbles. Historically, this phenomenon began to be studied as the dynamics of gas bubbles (Rayleigh-Pleset equation). Today, thanks to progress in computer technology, this phenomenon is studied at the level of bubble deformation during hydraulic shock. Another approach is to consider the dynamics of a multiphase (two-phase) medium in the form of a bubbly liquid. After several assumptions, the main one being a relatively small gas content in the liquid, the model consists of two differe

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