Relevant bibliographies by topics / Coefficient Difference (CD)

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Academic literature on the topic 'Coefficient Difference (CD)'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Coefficient Difference (CD)"

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Xu, Junli, Kai Ma, Yuling Nie, et al. "Numerical Study on Storm Surge Level Including Astronomical Tide Effect Using Data Assimilation Method." Atmosphere 14, no. 1 (2022): 38. http://dx.doi.org/10.3390/atmos14010038.

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In the storm surge model, the wind drag coefficient Cd is a critical parameter that has a great influence on the forecast of the storm surge level. In the present study, the effect of various wind drag coefficient parameterizations on the storm surge level is investigated in the Bohai Sea, Yellow Sea and East China Sea for Typhoons 7203 and 7303. Firstly, the impacts of initial values of a and b in the linear expression Cd = (a + b × U10) × 10−3 on the pure storm surge model are evaluated based on the data assimilation method. Results indicate that when a and b (i.e., the wind drag coefficient
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Manoj, Modi, D. Chougaonkar Swati, Patil V., et al. "Impact of Viscosity Variation, and Flow Rate on Coefficient of Discharge in Venturimeter Utilizing Taguchi Methodology." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 4 (2020): 1838–40. https://doi.org/10.35940/ijeat.D8364.049420.

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Most of the industries are concerned with flow measurement and accurate measurement of fluid is important to obtain specific proportion as per process requirement. Generally Venturimeter (VM) is utilized in enterprises due to notable highlights offered by it. VM works on the principle of pressure difference i.e. Bernoulli’s principle. By varying cross sectional area of flow, it creates pressure difference along its length which is used to calculate theoretical discharge. Head loss in VM is less as compared to other flow measuring apparatus. Because of its specific geometry eddies formati
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Arkhipov, V. A., S. A. Basalaev, K. G. Perfilieva, and A. S. Usanina. "DRAG COEFFICIENT OF A SOLID SPHERE UNDER NON-ISOTHERMAL CONDITIONS." Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, no. 71 (2021): 13–24. http://dx.doi.org/10.17223/19988621/71/2.

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The results of an experimental study of gravitational settling of a cooled (T = 82 K, 250 K) and a heated (T = 373 K, 473 K, 573 K) steel ball in glycerin and polymethylsiloxane liquids (PDMS-10000, PDMS-30000) in the range of the Reynolds numbers Re = 10−3–1 are presented. It is shown that the stationary velocity of gravitational settling of a particle decreases with its cooling and, conversely, it increases with heating of the particle. A time dependence of the distance traveled by the particle is found to be linear for both heated, cooled, and etalon (T = Tl) solid spheres. The effect of th
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Suk, S. А., and O. A. Venediktova. "PREDICTION OF VISUAL FUNCTION IN PATIENTS WITH DIABETIC MACULAR EDEMA IN TYPE 2 DIABETES." Medical Science of Ukraine (MSU) 21, no. 1 (2025): 27–36. https://doi.org/10.32345/2664-4738.1.2025.04.

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Background. Diabetic macular ischemia (DMI) and foveal avascular zone (FAZ) enlargement are two important clinical findings and biomarkers of poor visual function in patients with diabetic retinopathy (DR). OCT angiography (OCTA) is a noninvasive technique that allows to visualize the retinal plexuses layer by layer, to quantify microvascular parameters, and to correlate them with functional and morphological data. Research is oriented towards identifying earlier preclinical biomarkers of microvascular abnormality in diabetic retina and diabetic macular edema (DME), which is very important con
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Hill, Kevin A., and Gary M. Lackmann. "Analysis of Idealized Tropical Cyclone Simulations Using the Weather Research and Forecasting Model: Sensitivity to Turbulence Parameterization and Grid Spacing." Monthly Weather Review 137, no. 2 (2009): 745–65. http://dx.doi.org/10.1175/2008mwr2220.1.

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Abstract The Weather Research and Forecasting Advanced Research Model (WRF-ARW) was used to perform idealized tropical cyclone (TC) simulations, with domains of 36-, 12-, and 4-km horizontal grid spacing. Tests were conducted to determine the sensitivity of TC intensity to the available surface layer (SL) and planetary boundary layer (PBL) parameterizations, including the Yonsei University (YSU) and Mellor–Yamada–Janjic (MYJ) schemes, and to horizontal grid spacing. Simulations were run until a quasi-steady TC intensity was attained. Differences in minimum central pressure (Pmin) of up to 35 h
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Haposan Misaelman Sinaga and Wawan Aries Widodo. "Studi Pemodelan Numerik Penempatan Shark Fin Vortex Generator dengan Susunan Sebaris Pada Dindong Kiri dan Kanan Bus Penumpang." EduInovasi: Journal of Basic Educational Studies 4, no. 2 (2024): 1383–410. http://dx.doi.org/10.47467/edu.v4i2.4321.

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This study analyzes the impact of installing Shark Fin Vortex Generators (SFVG) in a row arrangement on the left and right sides of a passenger bus on the vehicle’s aerodynamic performance. A numerical modeling approach was used to visualize the airflow around the bus and measure key parameters such as drag coefficient (CD), lift coefficient (CL), and pressure coefficient (CP) distribution. Air velocity contour analysis shows that SFVG significantly optimizes airflow around the bus. The bus with SFVG achieved a higher airspeed of 50.23 km/h, while the bus without SFVG only reached 49.83 km/h,
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Donovan, Deborah A., Brian L. Bingham, Milton From, Abby F. Fleisch, and Eli S. Loomis. "Effects of barnacle encrustation on the swimming behaviour, energetics, morphometry, and drag coefficient of the scallop Chlamys hastata." Journal of the Marine Biological Association of the United Kingdom 83, no. 4 (2003): 813–19. http://dx.doi.org/10.1017/s0025315403007847h.

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Barnacle encrustation negatively influenced every aspect of swimming in the scallop Chlamys hastata measured in this study. Scallops swam significantly longer, travelled further and attained greater elevation once epibiotic barnacles had been removed. Shell morphometry of barnacle-encrusted scallops was similar to shells of unencrusted scallops. Specifically, shell length was positively allometric with shell height and shell mass was negatively allometric. However, adductor muscle mass scaled isometrically to shell height, in contrast to unencrusted scallops. In the laboratory, the drag coeffi
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Permatasari, Rosyida, and Gusty Widyawati. "Effect of Vortex Generators on Airfoil NACA 632-415 to Aerodynamic Characteristics Using CFD." International Journal of Electrical, Energy and Power System Engineering 6, no. 1 (2023): 133–37. http://dx.doi.org/10.31258/ijeepse.6.1.133-137.

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To determine the aircraft’s flight performance, the airfoil type must be considered when designing the wing. A vortex can form when the airfoil travels through a fluid stream with a difference in velocity and pressure around it. Airfoil modification is carried out to delay the occurrence of flow separation by adding a vortex generator. This paper discusses how adding the vortex generator helps slow the stall’s onset and how the vortex generator affects the fluid flow and aerodynamic forces acting on the NACA 632-415. The vortex generator profile is positioned at an x/c = 20% of the chord line’
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Lopes, Tiago J., Tatiana Sampaio, Mafalda P. Pinto, João P. Oliveira, Daniel A. Marinho, and Jorge E. Morais. "Comparison of the Active Drag and Passive Drag Coefficients at the same Swimming Speed Through Experimental Methods." Montenegrin Journal of Sports Science and Medicine 14, no. 1 (2025): 1–8. https://doi.org/10.26773/mjssm.250309.

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Studies about drag in swimming usually report or put the focus on its absolute value. However, it is being claimed that the drag coefficient better represents the hydrodynamic profile of a swimmer. Drag is strongly dependent on speed. Thus, increases in speed will lead to increases in drag. This could lead to misleading interpretations since drag is the water resistance that makes the swimmers’ displacement difficult. Conversely, the drag coefficient is less dependent on speed, which can be seen as a more appropriate measure of the swimmers’ hydrodynamic profile. This study used a complete exp
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Frihdianto, Fajar, Nyeyep Sri Wardani, and Indah Widiastuti. "ANALYSIS OF THE USE OF SPOILER ONE LEVEL AND TWO LEVELS IN CONDITIONS OF STEADY AGAINST THE DRAG AND LIFT COEFFICIENTS ON A SEDAN TYPE CAR BY USING CFD (COMPUTATIONAL FLUID DYNAMIC)." Journal of Mechanical Engineering and Vocational Education (JoMEVE) 1, no. 2 (2019): 58. http://dx.doi.org/10.20961/jomeve.v1i2.25066.

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<p><em>This research was simulation analyzing the condition of steady flow in around of body car made and analized computly using CFD program (Computational Fluid Dynamic). The model used was Sedan car designed with different rear end body by adding spoiler. Analyzing in this research was done by using Software 18.2–CFD Student Version. Design of the three models were compared to find out the difference in magnitude of Coefficient of Drag, Coefficient of Lift, pressure distribution, velocity distribution, and behavioral character of flow around the rear end of car in the condition
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Book chapters on the topic "Coefficient Difference (CD)"

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Akpila S.B. and Ejezie S.U. "Variation of Hydrodynamic Forces and Moments on Offshore Piles in the Niger Delta." In Proceedings of the 15th African Regional Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2011. https://doi.org/10.3233/978-1-60750-778-9-152.

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The variation of hydrodynamic forces and moments on different circular pile sections of 1.0 to 2.0 m diameters in the offshore Niger Delta Environment has been investigated. Available meteorological and oceanographic data were used to obtain wave characteristics. Inertia coefficient, cm and drag coefficient, cd were obtained from Reynolds number, Re, while maximum inertia force, kim, maximum drag force, kDm, maximum inertia moment, Sim and maximum drag moment, SDm were evaluated from standard charts. The revealed variation of hydrodynamic forces and moments with pile diameter showed that the h
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Pikuła, Dorota. "Effect of the Degree of Soil Contamination with Cd, Zn, Cu i Zn on Its Content in the Forder Crops and Mobility in the Soil Profile." In Environmental Sciences. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109245.

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In the micro plot experiment, the effect of varying light and medium soil contamination with heavy metals on their content in rye green fodder, serradella forage and barley, and the migration of Cd, Pb, Cu, and Zn in the soil profile was evaluated. Plants accumulated more heavy metals on light soil and soil with low organic matter content. Under the influence of increasing heavy metal contamination of soils, cadmium content increased more in fodder plants than lead content. After 14 years from the introduction of different rates of metals into the top layer (0–30 cm) of the two soils studied,
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Maslov, A. V., N. V. Politova, N. V. Kozina, et al. "Rare and trace elements in modern bottom sediments of the Barents sea. Nd, Pb and Sr isotopic composition." In THE BARENTS SEA SYSTEM. Shirshov Institute of Oceanology Publishing House, 2021. http://dx.doi.org/10.29006/978-5-6045110-0-8/(32).

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The article presents a brief lithological description of the modern bottom sediments of the Barents Sea, selected in the 67th voyage of the R/V “Akademik Mstislav Keldysh” at the polygons: 1) “Pechora Sea”; 2) “Western slope of Kaninskoe shoal”; 3) “Central Barents Sea (Shtokman area)”; 4) “Russkaya Gavan’ fjord”; 5) “Medvezhinsky Trench”; 6) in the area to the south of Spitsbergen; 7) “Kola meridian”; 8) “Spitsbergen – Franz Josef Land archipelago”; 9) “Cambridge Strait”. The distribution of Cr, Ni, Cu, Zn, Cd, and Pb in samples of bottom sediments (pelitic, aleurite-pelitic and sandy-aleurit
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Kumar, K. Karthik Selva, and L. A. Kumaraswamidhas. "Wake Interaction Using Lattice Boltzmann Method." In Advances in Computer and Electrical Engineering. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-4760-0.ch007.

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In this chapter, a brief discussion about the application of lattice Boltzmann method on complex flow characteristics over circular structures is presented. A two-dimensional computational simulation is performed to study the fluid flow characteristics by employing the lattice Boltzmann method (LBM) with respect to Bhatnagar-Gross-Krook (BGK) collision model to simulate the interaction of fluid flow over the circular cylinders at different spacing conditions. From the results, it is observed that there is no significant interaction between the wakes for the transverse spacing's ratio higher th
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Conference papers on the topic "Coefficient Difference (CD)"

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Petrushka, Kateryna, Myroslav Malovanyy, Ihor Petrushka, and Jolanta Warchoł. "Statistical Analysis of the Influence of Heavy Metals in the Soil on the Biometric Parameters of Plants as a Consequence of Military Actions." In 8th International Congress "Environment Protection. Energy Saving. Sustainable Environmental Management". Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-p86kay.

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Methods of assessing the intensity of plant growth in soils contaminated with elements of heavy metals as a result of military operations can provide important data regarding the migration, bioavailability of chemical compounds for plants, as a result of the formation of chemical compounds, which are key parameters for assessing the phytoremediation potential. The use of various methods of assessing the impact of heavy metals in the soil on plant growth can be evaluated not only based on the degree of environmental risk, but also predict the magnitude of the impact of a complex of chemical ele
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Li, Zhiheng, Jiawei Yu, Dakui Feng, Kaijun Jiang, and Yujie Zhou. "Research on the Improved Body-Force Method Based on Viscous Flow." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95887.

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Abstract The virtual propeller model can achieve the rapid numerical prediction of the ship self-propulsion performance through viscous flow, which used the improved body-force method. The two-dimensional lift coefficient CL and the drag coefficient CD are very important parameters in this method, which are generally obtained by the potential flow methods and cannot incorporate viscous effects. This study will perform a fully nonlinear unsteady RANS (Reynolds Average Navier-Stokes) simulation to get the KP505 open-water characteristics and then divide its blade into several parts to get the li
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Koizumi, Yasuo, Atsushi Katsuta, and Hiroyasu Ohtake. "Flow and Heat Transfer of Micro-Tube Bank." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30711.

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Heat transfer and flow behavior in a mini-tube bank was examined. The tube bank was simulated with wires of 1 mm diameter. The wires were arranged in the 5×5 in-line array and the 5×5 staggered array with the arranging pitch = 3. Experiments were performed in the range of the tube Reynolds number Re = 4 ∼ 3,500. Numerical analyses were also performed with the commercial CFD code of STAR-CD. The heat transfer coefficient of the tube of the first row was well expressed with the existing heat transfer correlations. In the case of the in-line array, unlike usual sized tube banks, the measured heat
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Arai, M., Y. Koizumi, and H. Ohtake. "Study on Heat Transfer and Flow Analysis of 5×5 and 5×1 Mini-Tube Bank of Micro Heat Exchanger." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41608.

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Heat transfer and flow behavior in the mini rod bank were examined. The tube bank was simulated with 5 wires of 1 mm diameter. The wires were arranged on the center line of the flow channel of 30 mm wide, 15 mm high and 300 mm long. The pitch between wires were varied from 1.5 mm to 9 mm. Experiments were performed in the range of the rod Re = 1 ∼ 400, i.e. the flow velocity in the channel was in the range of 0.0036 m/s ∼ 0.34 m/s. The measured heat transfer coefficients of the first row were a little bit higher than, rather close to, the predicted values by the correlations. The heat transfer
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Abu-Nada, Eiyad, and AbdelSalam Al-Sarkhi. "Numerical Study of Skin Friction Coefficient and Reattachment Length for a Slip Flow Encountered in a Partially Blocked Channel." In ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2350.

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The current research investigates the effect of Reynolds number and Knudsen number on the coefficient of skin friction and reattachment length for a micro-scale fluid flow over a step mounted on a lower wall of a micro-channel. Five Reynolds numbers are studied Re = 1, 10, 25, 50, and 75 and the Knudsen number is varied from 1×10−3 to 0.1. Finite difference method with non-uniform grid is used to solve the incompressible Navier Stokes equations accompanied with velocity slip boundary condition. As Knudsen number (Kn) decreases the magnitude of modified local shear stress (1/2 Cf Re), on the up
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Du, Lue Derek, and Charles Dalton. "A CFD Study of Flow Past a Rotating Cylinder to Re = 1000." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30100.

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In this paper, we examine, computationally, a uniform flow past a rotating circular cylinder. The objective is to determine the effect the rotation has on the lift and drag acting on the cylinder, on the vortex structures and on the vortex-shedding frequency. A streakline calculation illustrates the effect the rotation has on the vortex-structure in the wake. A combination of finite-difference and spectral methods is used to calculate the three-dimensional incompressible unsteady Navier-Stokes equations in primitive variable form in nonorthogonal curvilinear coordinates. A second-order accurat
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Soloiu, Valentin, Lily Parker, Richard Smith, et al. "Development of a Synthetic Surrogate for F-24 From Blends of Iso-Paraffinic Kerosene (IPK) and Fischer-Tropsch Synthetic Kerosene (S8) in a Constant Volume Combustion Chamber (CVCC)." In ASME 2022 ICE Forward Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icef2022-91028.

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Abstract Investigations were conducted using mass blends of Iso-Paraffinic Kerosene (IPK) and Fischer-Tropsch Synthetic Kerosene (S8) to produce a synthetic surrogate for aerospace F-24. Due to the fossil fuel origin of F-24, the introduction of a synthetic surrogate would create a sustainable aviation fuel (SAF) with sources obtained from within the United States. An analysis of ignition delay (ID), combustion delay (CD), derived cetane number (DCN), negative temperature coefficient (NTC) region, Low-Temperature Heat Release region (LTHR) and High-Temperature Heat Release (HTHR) was conducted
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Stepanova, Natalya, Emiliya Valeeva, Amr S. Elbahnasawy, Oxana Sinitsyna, Suryana Fomina, and Aizat Basyyrov. "THREE-DIMENSIONAL ANALYSIS OF THE CITY ENVIRONMENT CONTAMINATION WITH HEAVY METALS BASED ON THE FINDINGS OF THE SNOW COVER STUDY." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/4.2/s19.56.

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Analysis of the air environment and atmospheric emissions is an efficient method for assessing the ecological situation in cities. Assessment of the chemical composition of deposit environments (soil, snow) shows long-term contamination. The snow cover (SC), being a natural accumulating plate, reflects environmental contamination with heavy metals (HM) caused by entry from various sources. The work aims to study the three-dimensional dynamics of large city contamination with HM. Sampling (in 2019 - 100, in 2020-100, in 2021 - 280) was performed in the first decade of March. The samples were an
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Soloiu, Valentin, Amanda Weaver, James Willis, Aidan Rowell, and Nicholas Dillon. "Combustion Research in Wide DCN Range Synthetic Aviation Fuels in a High Compression Ratio Engine." In ASME 2023 ICE Forward Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/icef2023-110189.

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Abstract An investigation was conducted on the performance and emissions characteristics of two Fischer-Tropsch (F-T) synthetic kerosenes, Gas-to-Liquid (GTL) S8 and Coal-to-Liquid (CTL) Iso-Paraffinic Kerosene (IPK), in a high compression ratio research engine with separate combustion chamber and using neat ULSD as a baseline. A 50% and a 70% by mass blend S8 with ULSD and a 50% and a 70% by mass blend of IPK with ULSD were analyzed for performance and emissions at 5, 6, and 7 bar Indicated Mean Effective Pressure (IMEP) and 2400 rpm. Additionally, neat S8, neat IPK, and neat ULSD were invest
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Many, Hariprasad Chakkalaparambil, Vishnu Chandar Srinivasan, and Ajith Kumar Raghavan. "Effect of Corner-Arc on the Flow Structures Around a Square Cylinder." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83367.

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In this paper, flow structures around a corner modified square cylinder (side dimension, Bo) are presented and discussed. Cylinders with various corner arcs (circular) were considered (arc radius ‘r’). For various Corner Ratios (CR = r/Bo), values ranging from 0 to 0.5, flow visualization experiments were conducted in a water channel and the results are reported at Re = 2100 (based on Bo). Results presented are for two cases (a) stationary cylinders reporting the values of CD (coefficient of drag), St (Strouhal no.), and D (vortex size) and (b) oscillating cylinders at fe/fs = 1 (fe is the cyl
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