Relevant bibliographies by topics / Turbulentné modely

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Academic literature on the topic 'Turbulentné modely'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Turbulentné modely"

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Souza, José Francisco Almeida de, José Luiz Lima de Azevedo, Leopoldo Rota de Oliveira, Ivan Dias Soares, and Maurício Magalhães Mata. "TURBULENCE MODELING IN GEOPHYSICAL FLOWS – PART I – FIRST-ORDER TURBULENT CLOSURE MODELING." Revista Brasileira de Geofísica 32, no. 1 (March 1, 2014): 31. http://dx.doi.org/10.22564/rbgf.v32i1.395.

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ABSTRACT. The usage of so-called turbulence closure models within hydrodynamic circulation models comes from the need to adequately describe vertical mixing processes. Even among the classical turbulence models; that is, those based on the Reynolds decomposition technique (Reynolds Averaged Navier-Stokes – RANS), there is a variety of approaches that can be followed for the modeling of turbulent flows (second moment) of momentum, heat, salinity, and other properties. Essentially, these approaches are divided into those which use the concept of turbulent viscosity/diffusivity in the modeling of the second moment, and those which do not use it. In this work we present and discuss the models that employ this concept, in which the viscosity can be considered constant or variable. In this latter scenario, besides those that use the concepts of mixture length, the models that use one or two differential transport equations for determining the viscosity are presented. The fact that two transport equations are used – one for the turbulent kinetic energy and the other for the turbulent length scale – make these latter ones the most complete turbulent closure models in this category. Keywords: turbulence modeling, turbulence models, first-order models, first-order turbulent closure. RESUMO. A descrição adequada dos processos de mistura vertical nos modelos de circulação hidrodinâmica é o objetivo dos chamados modelos de turbulência, os quais são acoplados aos primeiros. Mesmo entre os modelos clássicos de turbulência, isto é, aqueles que se baseiam na técnica de decomposição de Reynolds (Reynolds Averaged Navier-Stokes – RANS), existe uma variedade de abordagens que podem ser seguidas na modelagem dos fluxos turbulentos (segundos momentos) de momentum, calor, salinidade e outras propriedades. Fundamentalmente estas abordagens dividem-se entre aquelas que utilizam o conceito de viscosidade/ difusividade turbulenta na modelagem dos segundos momentos, e aquelas que não o utilizam. Nesse trabalho são apresentados e discutidos os modelos que empregam este conceito, onde a viscosidade pode ser considerada constante ou variável. No caso variável, além daqueles que utilizam o conceito de comprimento de mistura, são ainda apresentados os modelos que utilizam uma ou duas equações diferenciais de transporte para a determinação da viscosidade. O fato de empregar duas equações de transporte, uma para a energia cinética turbulenta e outra para a escala de comprimento turbulento, fazem destes últimos os mais completos modelos de fechamento turbulento desta categoria. Palavras-chave: modelagem da turbulência, modelos de turbulência, modelos de primeira ordem, fechamento turbulento de primeira orde
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Rincón-Díaz, Carlos A., and José Albors-Garrigós. "Sustaining strategies in RTOs. A contingent model for understanding RTOs’ perfomance." Dirección y Organización, no. 50 (July 1, 2013): 74–84. http://dx.doi.org/10.37610/dyo.v0i50.433.

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The objectives of this paper are to propose a contingent model linking context, organizational and performance variables, and to identify barriers that Research and Technology Organisations have to overcome to work with companies. Fur thermore, there is discussion of the best practices that Research and Technology Organisations carry out in order to develop competitive advantages and adjust to turbulent environments. This research was based on a field study of 14 Research and Technology Organisations in the Valencian Community and 13 Research and Technology Organisations in the Basque Country. The study identifies certain factors which could improve their performance to address properly changes in their environment and become more competitive.Keywords: research and technology organisations (RTOs), innovation strategies, turbulent environment, RTO challenges.Estrategias de sostenimiento de los Centros Tecnológicos. Un modelo contingente para entender su desempeñoResumen: Los objetivos de este trabajo son proponer un modelo contingente que relaciona variables de contexto, organizacionales y de resultado, e identificar las barreras que los Centros Tecnológicos encuentran para trabajar con empresas y las buenas prácticas llevan a cabo para desarrollar ventajas competitivas y adaptarse en entornos turbulentos. Esta investigación se baso en un estudio de catorce Centros tecnológicos de la Comunidad Valenciana y trece Centros Tecnológicos del País Vasco. El estudio propone algunos factores a mejorar para que los Centros Tecnológicos afronten adecuadamente los cambios en su entorno y sean más competitivos.Palabras clave: centros tecnológicos (CT), estrategias de innovación, entorno turbulento, retos de los centros tecnológicos.
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Antunes do Carmo, José S., A. Temperville, and Fernando J. Seabra-Santos. "Fricción y tensión tangencial por fondo con ola y corriente." Ingeniería del agua 10, no. 2 (June 1, 2003): 177. http://dx.doi.org/10.4995/ia.2003.2583.

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Se calcula la tensión tangencial debido a ola y corriente mediante un modelo numérico con cierre turbulento K-L, donde K es la energía cinética turbulenta y L es la escala longitudinal de turbulencia. Se obtiene el coeficiente de fricción parametrizado para el caso de flujo turbulento rugoso, siguiendo a Soulsby et al. (1994) y se amplía al caso de flujo turbulento liso. La comparación de estos resultados con otros existentes en la literatura, especialmente los proporcionados por Tanaka y Thu (1994) muestra un buen ajuste.Se propone una nueva parametrización de la serie temporal de la tensión tangencial que incluye el coeficiente de fricción local obteniéndose mejores resultados que aplicando la parametrización propuesta por Soulsby et al. (1994).
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Navas-Montilla, A., J. Murillo, and P. García-Navarro. "Modelos de simulación de alto orden para la resolución de fenómenos de propagación de ondas en flujos de lámina libre con turbulencia." Ingeniería del agua 23, no. 4 (October 31, 2019): 275. http://dx.doi.org/10.4995/ia.2019.12169.

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<p>En este trabajo se presenta una herramienta de simulación basada en la resolución transitoria de grandes remolinos (URANS o DA-LES) para flujos turbulentos de aguas poco profundas en los que la turbulencia es predominantemente horizontal. El aspecto fundamental del modelo es la combinación de una discretización de alto orden en espacio y tiempo con una modelización de los efectos en el flujo promedio de las escalas turbulentas no resueltas. El modelo propuesto garantiza con precisión de máquina el equilibrio hidrostático (propiedad well-balanced) gracias a la utilización de una formulación del flujo numérico que incluye los términos fuente en la resolución del problema de Riemann derivativo en las paredes de las celdas. Se presenta una validación del modelo utilizando datos de literatura para un experimento de laboratorio que involucra un flujo de aguas poco profundas sobre una isla cónica, que da lugar a la generación de una calle de vórtices aguas abajo de la isla. Los resultados numéricos muestran que el modelo propuesto es capaz de reproducir fenómenos turbulentos bidimensionales, proporcionando un mayor nivel de detalle que la aproximación RANS tradicional.</p>
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Masamoto, Kai, Masayuki Takahashi, and Shinnosuke Obi. "MoP-12 Experimental Study on the Turbulent Flow in a Simplified HDD Model." Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2015 (2015): _MoP—12–1_—_MoP—12–3_. http://dx.doi.org/10.1299/jsmemipe.2015._mop-12-1_.

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Sengupta, Samiran, P. K. Vijayan, K. Sasidharan, and V. K. Raina. "ICONE19-43613 TURBULENT MIXING INSIDE THE CHIMNEY MODEL OF A POOL TYPE RESEARCH REACTOR." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_248.

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Sventitskiy, Alexander E., and Vladlen A. Zazimko. "THE NUMERICAL MODEL OF MULTIPLE SUPERSONIC TURBULENT JETS OF DIFFERENT GAS COMPOSITION(Multiple Jet)." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 273–78. http://dx.doi.org/10.1299/jsmeicjwsf.2005.273.

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Mueller, Michael E., and Venkat Raman. "Model form uncertainty quantification in turbulent combustion simulations: Peer models." Combustion and Flame 187 (January 2018): 137–46. http://dx.doi.org/10.1016/j.combustflame.2017.09.011.

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Fischer Filho, João Alberto, Yane De Freitas Da Silva, Alexandre Barcellos Dalri, Luiz Fabiano Palaretti, José Renato Zanini, and Anderson Prates Coelho. "CARACTERIZAÇÃO HIDRÁULICA DE GOTEJADORES DE FLUXO TURBULENTO." IRRIGA 23, no. 2 (October 9, 2018): 380–89. http://dx.doi.org/10.15809/irriga.2018v23n2p380-389.

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CARACTERIZAÇÃO HIDRÁULICA DE GOTEJADORES DE FLUXO TURBULENTO JOÃO A. FISCHER FILHO; YANE DE FREITAS DA SILVA; ALEXANDRE B. DALRI; LUIZ FABIANO PALARETTI; JOSÉ R. ZANINI E ANDERSON PRATES COELHO Departamento de Engenharia Rural, Universidade Estadual Paulista – Câmpus Jaboticabal, Via de Acesso Professor Paulo Donato Castelane, Vila Industrial, Jaboticabal, SP, Brasil. E-mail: joaofischer16@gmail.com, yanefsilva@gmail.com, dalri@fcav.unesp.br. lfpalaretti@fcav.unesp.br, jrzanini@fcav.unesp.br, anderson_100ssp@hotmail.com 1 RESUMO Na avaliação do desempenho hidráulico de quatro modelos de gotejadores não autocompensantes foi utilizada uma bancada de ensaios com capacidade para 25 gotejadores de cada modelo. Cada modelo foi submetido a diferentes pressões (p), determinando-se assim a vazão média (q), o coeficiente de variação de fabricação (CVf) e a equação característica do gotejador (q versus p). Posteriormente foram determinados, em condições de campo, em uma área plana, os coeficientes de uniformidade de Christiansen (CUC) e de distribuição (CUD) para 16 gotejadores de cada modelo avaliado. Foi adotado delineamento inteiramente casualizado com quatro repetições e teste de Tukey para comparação das médias de CUC e CUD. Os quatro modelos, operando nas pressões nominais, apresentaram vazões de, respectivamente, 2,22; 1,30; 1,45 e 1,93 L h-1 e CVf médio de, respectivamente, 1,30%; 3,61%; 2,65% e 3,97%, sendo caracterizados como de excelente e média uniformidade. Os quatro modelos enquadraram-se em regime de escoamento turbulento, com valores de expoente “x” da equação característica do gotejador variando entre 0,4714 e 0,5174e coeficientes de determinação R2 superiores a 99%. Os valores de CUC e CUD diferiram estatisticamente e foram, em média, superiores a 90% e, destacando positivamente os gotejadores Driptech e Dripline. Palavras–chave: equação característica, irrigação por gotejamento, uniformidade FISCHER FILHO, J. A.; SILVA, Y. F.; DALRI, A. B.; PALARETTI, L. F.; ZANINI, J. R.; COELHO, A. P. HYDRAULIC CHARACTERIZATION OF TURBULENT FLOW DRIPPERS 2 ABSTRACT In the evaluation of hydraulic performance of four models of not self-compensating drippers was used a bench of tests with capacity for 25 drippers of each model. Each model was subjected to different pressures (p), thus determining the mean flow rate (q), the coefficient of manufacturing variation (CVf) and the characteristic equation of the dripper (q versus p). Subsequently, the Christiansen (CUC) and distribution (CUD) uniformity coefficients for 16 drippers of each evaluated model were determined under field conditions in a flat area. A completely randomized design with four repetitions and Tukey’s test were used to compare means of CUD and CUC. The four models, operating at nominal pressures, had flow rates of, respectively, 2.22; 1.30; 1.45 and 1.93 L h-1 and mean CVf of, respectively, 1.30%; 3.61%; 2.65% and 3.97%, being characterized as having excellent and average uniformity. The four models were fitted under a turbulent flow regime, with exponent values "x" of the characteristic equation of the dripper varying between 0.4714 and 0.5174, and R2 determination coefficients above 99%. The values of CUC and CUD differed statistically and were, on average, higher than 90% and, in particular, the Driptech and Dripline drippers. Keywords: characteristic equation, drip irrigation, uniformity
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Tamaru, Akihiro, and Shinnosuke Obi. "MoP-11 Large Eddy Simulation for Turbulent Flow in a simplified HDD Model using OpenFOAM." Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2015 (2015): _MoP—11–1_—_MoP—11–3_. http://dx.doi.org/10.1299/jsmemipe.2015._mop-11-1_.

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Dissertations / Theses on the topic "Turbulentné modely"

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Páleš, Patrik. "Rotace kola ve výpočtech externí aerodynamiky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231736.

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The aim of the master’s thesis is an investigation of volume mesh quality, turbulent models and models of rotation and their influence on aerodynamic coefficients of rotating wheels. Mesh independence study and near-wall prism layer modelling are also of high importance. Subsequently, the appropriate turbulent model is used for research of wheel rotation on drag and lift on a front and rear axle of the vehicle compared to the stationary case.
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Brol, Keila Belquiz. "Modelagem e análise de selos de fluxo aplicados a máquinas rotativas." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263055.

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Orientador: Katia Lucchesi Cavalca
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: O desenvolvimento de modelos matemáticos que visam simular as características operacionais das máquinas rotativas é importante para representar uma variedade de fenômenos expressivos que se manifestam durante a operação, para tanto é necessário a modelagem dos componentes que caracterizam o comportamento dinâmico do sistema. Este trabalho tem por objetivo determinar os parâmetros físicos que integram os selos de fluxo de folga fixa e angular ao modelo global de sistemas rotativos. As rigidezes e os amortecimentos são obtidos através da solução de equações governantes para líquidos escoando em selos anulares pelo método clássico das perturbações de ordem máxima um e a solução da ordem zero permite demonstrar a variação da pressão e velocidade para as equações de ordem zero. Os resultados obtidos foram validados com os valores apresentados pela literatura. O resultado deste trabalho poderá ser aplicado na modelagem global de uma máquina rotativa, de modo a tornar a análise mais completa do conjunto girante
Abstract: The development of mathematical models designed to simulate operational characteristics is important to represent a wide variety of expressive phenomena that manifest during the operation, and therefore it is necessary the components modeling that characterize the system dynamic behavior. This study aims to determine the physical parameters that influence the flow seals to fixed angles and variables in the global rotating systems model. The stiffness and damping are obtained by solving the governing equations for fluid flowing in the annular seals using the classic perturbation method of maximal order one. The zero-order solution allows to demonstrate the pressure and speed variation to zero order. The results were validated with the similar tests reported in the literature. This work results are eligible to be applied to model a global rotating machine in order to make a more complete rotor analysis
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
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Souza, Karine Cristiane de Oliveira. "Avaliação de soluções analíticas para escoamentos turbulentos." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-12082016-162604/.

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A partir da solução analítica obtida para o campo turbulento gerado por duas grades oscilantes em fluido em repouso, considerados os casos de viscosidade constante e viscosidade variável, foram estudados escoamentos turbulentos complexos. A partir de proposta de equação governante linear ainda não publicada de SCHULZ (2003a), foram obtidas soluções promissoras e exploradas possibilidades de generalização. As equações em questão baseiam-se no modelo κ-ε. A ferramenta de trabalho no estudo das soluções teóricas foi o programa Mathematica. Embora essa ferramenta simplifique o trabalho mecânico decorrente da busca de soluções viáveis, vale lembrar que a construção do problema depende da criatividade do estudioso. Os objetivos propostos foram atingidos: reproduzir e ampliar os resultados para grades oscilantes de SCHULZ (2001). Adicionalmente, os equacionamentos governantes lineares mostraram possuir soluções compatíveis com a observação.
From the analytical solution of turbulent field generated by two oscillating grids in fluid in rest, complex turbulent flows have been studied considering the cases of constant and variable viscosities. Promising solutions as well as some turbulence generalization possibilities were obtained considering SCHULZ\'s (2003) non-published proposal of linear governing equations. The solutions are based on the κ-ε model. The Mathematica program was used as a tool in the study of the theoretical solutions. Although this tool simplifies the work derived from the search for viable solutions, it is important to remember that the construction of the problem depends on the researcher\'s skills. The aims of reproducing and extending SCHULZ\'s (2001) model for oscillating grids have been achieved. Additionally, the linear governing equations have shown to have compatible solutions with the observation.
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Neto, Severino Cirino de Lima. "Análise híbrida do escoamento turbulento em canais via modelos de turbulência de uma equação de transporte." Universidade Federal da Paraí­ba, 2006. http://tede.biblioteca.ufpb.br:8080/handle/tede/5408.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The present work consists of a hybrid numerical-analytical simulation of the developing and fully developed turbulent flows inside a parallel-plates channel. The Reynolds equations for the mean flow are solved through the Generalized Integral Transform Technique (GITT) in the boundary layer and streamfunction-only formulations. For turbulence closure, the respectively one-equation turbulence models, and some of their variations, developed by Secundov (1972), Baldwin e Barth (1990), Spalart e Allmaras (1992, 1994) and Menter (1997) were employed. Despite of based on the eddy viscosity concept, as the well-known one-equation k-L turbulence model previously adopted in works that made use of the present hybrid solution methodology, such models do not need any explicit length scale, and therefore are more generals, but only one transport equation for the turbulent viscosity or for a variable directly related to the eddy viscosity. In this sense, some simulations for different Reynolds numbers and different turbulent inlet conditions were developed in order to, in function of the obtained results and the convergence studies of the main potentials involved in the simulations, develop a critically and detailed discussion of the main shortcomings and capability predictions of each turbulence model adopted, such as the non-asymptotic development of the longitudinal velocity component and the friction factor fields. As a consequence of the analysis type performed over each turbulence model investigated and, in addition, due to the excellent numerical quality of the obtained results, the present work extends and consolidates the very important role that the integral transform technique may play in the computational fluid dynamics field meanwhile hybrid methodology.
O presente trabalho consiste na simulação numérico-analítica do escoamento turbulento isotérmico, em desenvolvimento e completamente desenvolvido, no interior de um canal de placas planas e paralelas, através da Técnica da Transformada Integral Generalizada (GITT). As equações médias de Reynolds, escritas segundo as hipótese de camada limite são empregadas na formulação de função corrente. Para o fechamento das equações médias da turbulência foram empregados os modelos de turbulência de uma equação de transporte (e algumas de suas variações) desenvolvidos pelos seguintes autores: Secundov (1972), Baldwin e Barth (1990), Spalart e Allmaras (1992, 1994) e Menter (1997). Apesar de baseados no conceito de viscosidade turbilhonar ( eddy viscosity ), como o tradicional modelo de turbulência de uma equação k-L, anteriormente empregado em trabalhos que fizeram uso da presente metodologia híbrida de solução, tais modelos não necessitam de uma escala explícita de comprimento, e por isso são ditos mais gerais, mas sim, de apenas uma equação de transporte para a própria viscosidade turbulenta (ou uma variável diretamente relacionada à própria viscosidade turbulenta). Nesse sentido, foram simuladas algumas situações de escoamentos (diferentes números de Reynolds e diferentes condições de entrada turbulenta) e buscou-se, em função dos resultados obtidos e de estudos de convergência dos principais potenciais envolvidos nas simulações, uma criteriosa e detalhada discussão das capacidades de previsão de certas características inerentes ao escoamento (o pico da componente longitudinal da velocidade no centro do canal e a depressão do fator de atrito, durante o desenvolvimento do escoamento, ou seja, o comportamento não assintótico dessas variáveis no escoamento) por todos os modelos de turbulência empregados. Em função do tipo de análise oferecida sobre cada modelo de turbulência utilizado, e, em adição, da excelente qualidade dos resultados obtidos com o uso da GITT, o presente trabalho extende e consolida o importante papel que a técnica da transformada integral pode desempenhar no campo da simulação computacional, enquanto metodologia híbrida.
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Šilhánková, Lenka. "Numerické modelování přepadu vody přes přeliv." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409722.

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This thesis deals with the numerical modeling of water overflow over the front spillway. The aim of the thesis is to calculate various types of turbulent models and to assess the overflow coefficient on a sharp front spillway. The model was created in free software SketchUp, but the modeling itself was carried out in FLOW-3D software. The content of the work is a description of used software, design and calculation.
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Kacálková, Eva. "Numerické modelování hydraulických ztrát v potrubí ve 3D." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240044.

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The bachelor´s thesis deals with numerical modelling of energy losses in pipes in 3D. It shows the process of creation of mathematical model, used mathematical equations and numerical methods of their solution. The theory is applied on the creation of pipe model and their energy losses with using different turbulent models.
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Nguyen, Dinh Duong. "Some results on turbulent models." Thesis, Rennes 1, 2020. https://ged.univ-rennes1.fr/nuxeo/site/esupversions/c3bf8d92-25f2-4242-af95-a9625f7ab4a0.

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L'objectif de la thèse est double : d'une part la thèse propose de nouveaux modèles turbulents et leur analyse également. Plus précisément, sur la base d'une modélisation de turbulence de base, de nouvelles formes d'hypothèse de Boussinesq - qui prennent en compte la rétrodiffusion d'énergie - sont obtenues. Ensuite, des outils d'analyse fonctionnelle sont appliqués pour prouver l'existence et l'unicité de solutions faibles aux modèles proposés. D'autre part, le manuscrit donne le taux de convergence des modèles de $\alpha $-régularisation aux équations de Navier-Stokes. Plus précisément, l'erreur de modélisation est étudiée dans le cas d'un réglage périodique bidimensionnel de l'espace
The aim of the dissertation is twofold: On one hand the thesis provides new turbulent models and their analysis as well. More precisely, based on basic turbulence modeling new forms of Boussinesq assumption --which take into account of back-scatter of energy-- are obtained. Then functional analysis tools are applied to prove the existence and uniqueness of weak solutions to the proposed models. On the other hand the manuscript gives the rate of convergence of $\alpha$-regularization models to the Navier-Stokes equations. More exactly, the modeling error is investigated in the case of two-dimensional space-periodic setting
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Nathani, Arun. "A turbulent combustion noise model." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43102.

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A turbulent combustion noise model based on first principles is developed in this thesis. The model predicts (1) the pressure time series, (2) Sound Pressure Level (SPL) spectrum, (3) Over-All Sound Pressure Level (OASPL), (4) the thermoacoustic efficiency, (5) the peak frequency, and (6) the sound power of combustion generated noise. In addition, a correlation for sound power is developed based on fundamental burner and fuel variables known to affect the acoustic characteristics of turbulent combustion. The predicted pressure time series exhibits consistency with reality in that it has no steady component. It also confirms speculation in the literature that the predominant noise mechanism in open turbulent flames results from a "transition burning" phenomenon at the flame front. The predicted Sound Pressure Level spectrum, Over-All Sound Pressure Level, and the thermoacoustic efficiency are in excellent agreement with the results available in the literature. The shifts in the peak frequency with basic burner and fuel parameters are consistent with experimental observations from the literature. The disagreements between the predicted and the observed exponents of fuel and burner parameters for sound power are shown to be well within the standard deviation of the experimental observations. Certain areas for further analytical research on the combustion noise mechanism are identified.
Master of Science
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Silva, Arianne Alves da. "Simulação numérica da estabilidade de escoamentos de um fluido Giesekus." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-23102018-160615/.

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Diversas aplicações industriais utilizam escoamentos de fluidos viscoelásticos, e em muitos casos é necessário saber se os escoamentos propagam-se no estado laminar ou no turbulento. Embora a hidrodinâmica de fluidos viscoelásticos seja fortemente afetada pelo balanço entre forças inerciais e elásticas no escoamento, o efeito da elasticidade sobre a estabilidade de escoamentos inerciais não foi completamente estabelecido. Neste trabalho, estuda-se o que ocorre durante a transição laminar-turbulenta, investigando a convecção de ondas de Tollmien-Schlichting para o escoamento incompressível, para um fluido viscoelástico, entre placas paralelas, utilizando a equação constitutiva Giesekus. Para isto, adotou-se a simulação numérica direta para verificar a estabilidade dos escoamentos à perturbações não estacionárias deste fluido. Experimentos computacionais para verificação do código foram realizados. Com os resultados numéricos obtidos, foi possível verificar e analizar a estabilidade de escoamentos utilizando-se o modelo não newtoniano Giesekus.
Several industrial applications use viscoelastic fluid flows, and it is necessary to know if the flows propagate in the laminar or turbulent state. Although the hydrodynamics of viscoelastic fluids is strongly affected by the balance between inertial and elastic forces in the flow, the effect of elasticity on the stability of inertial flows has not been completely established. In this work we study what happens during the laminar-turbulent transition, investigating the convection of Tollmien-Schlichting waves for the incompressible flow, for a viscoelastic fluid, between parallel plates, using the constitutive equation Giesekus. For this, the direct numerical simulation was used to verify the stability of the flows to the non-stationary perturbations of this fluid. Computational experiments to verify the code were performed. With the numerical results obtained, it was possible to verify and analyze the stability of flows modelled by Giesekus non-newtonian model.
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Maluš, Miroslav. "Komplexní model turbulence pro různé velikosti cel." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442416.

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This diploma thesis is about creating a program to model turbulent cells of different sizes on the chosen transmission path. The initial part of the work is devoted to the formation of atmospheric turbulence and the mathematical description of the extent of turbulence and its effect on optical waves. The methods of the turbulence generation and their physical description of formation are described below. The practical part is devoted to the created program in the MATLAB.
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Books on the topic "Turbulentné modely"

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López, Simón Domingo. Numerische Modellierung turbulenter Umströmungen von Gebäuden =: Numerical modelling of turbulent flow around buildings. Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung, 2002.

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Piquet, Jean. Turbulent flows: Models and physics. Berlin: Springer-Verlag, 1999.

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Piquet, Jean. Turbulent flows: Models and physics. 2nd ed. Berlin: Springer, 2001.

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Piquet, Jean. Turbulent Flows: Models and Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999.

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Comin, Diego. Turbulent firms, turbulent wages? Cambridge, Mass: National Bureau of Economic Research, 2006.

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Speziale, Charles G. Second-order closure models for rotating turbulent flows. Hampton, Va: ICASE, 1985.

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Rodean, Howard C. Stochastic Lagrangian models of turbulent diffusion. Boston, Mass: American Meteorological Society, 1996.

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Thomson, David John. Random walk models of turbulent dispersion. Uxbridge: Brunel University, 1988.

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Rodean, Howard C. Stochastic Lagrangian Models of Turbulent Diffusion. Boston, MA: American Meteorological Society, 1996. http://dx.doi.org/10.1007/978-1-935704-11-9.

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York, B. Calculation of a class of two-dimensional turbulent boundary layer flows using the Baldwin-Lomax model. New York: American Institute of Aeronautics and Astronautics, 1985.

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Book chapters on the topic "Turbulentné modely"

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Ehrich, Sebastian. "Turbulent Inflow Models." In Handbook of Wind Energy Aerodynamics, 1–27. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-05455-7_42-1.

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Menon, Suresh, and Alan R. Kerstein. "The Linear-Eddy Model." In Turbulent Combustion Modeling, 221–47. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1_10.

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Echekki, Tarek, Alan R. Kerstein, and James C. Sutherland. "The One-Dimensional-Turbulence Model." In Turbulent Combustion Modeling, 249–76. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1_11.

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Kronenburg, A., and E. Mastorakos. "The Conditional Moment Closure Model." In Turbulent Combustion Modeling, 91–117. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1_5.

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Goussis, Dimitris A., and Ulrich Maas. "Model Reduction for Combustion Chemistry." In Turbulent Combustion Modeling, 193–220. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1_9.

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Burnat, M. "On Some Models of Turbulent Flow." In Laminar-Turbulent Transition, 729–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82462-3_91.

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Nehring, U. "Model Equations Simulating Unsteady Viscous Flows." In Laminar-Turbulent Transition, 711–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82462-3_88.

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Roos Launchbury, David. "Subgrid Models." In Unsteady Turbulent Flow Modelling and Applications, 7–14. Wiesbaden: Springer Fachmedien Wiesbaden, 2016. http://dx.doi.org/10.1007/978-3-658-11912-6_3.

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Borghi, R., and E. Pourbaix. "Lagrangian Models for Turbulent Combustion." In Turbulent Shear Flows 4, 369–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-69996-2_30.

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Cuenot, Bénédicte. "The Flamelet Model for Non-Premixed Combustion." In Turbulent Combustion Modeling, 43–61. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1_3.

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Conference papers on the topic "Turbulentné modely"

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Garbet, X., and Sadruddin Benkadda. "Turbulence scaling laws and transport models." In TURBULENT TRANSPORT IN FUSION PLASMAS: First ITER International Summer School. AIP, 2008. http://dx.doi.org/10.1063/1.2939038.

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Dorland, W., G. w. Hammett, T. S. Hahm, and M. A. Beer. "Nonlinear gyrofluid model of ITG turbulence." In U.S.-Japan workshop on ion temperature gradient-driven turbulent transport. AIP, 1994. http://dx.doi.org/10.1063/1.44513.

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Nordman, H., and J. Weiland. "Reactive drift wave model for tokamak transport." In U.S.-Japan workshop on ion temperature gradient-driven turbulent transport. AIP, 1994. http://dx.doi.org/10.1063/1.44511.

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Sugama, H., M. Okamoto, and M. Wakatani. "Transport analysis based on K-ɛ anomalous transport model." In U.S.-Japan workshop on ion temperature gradient-driven turbulent transport. AIP, 1994. http://dx.doi.org/10.1063/1.44521.

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Zimmerman, Daniel S. "Characterization of the magnetorotational instability from a turbulent background state." In MHD COUETTE FLOWS: Experiments and Models. AIP, 2004. http://dx.doi.org/10.1063/1.1832133.

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Waltz, R. E., and G. D. Kerbel. "Toroidal turbulence simulations with gyro-Landau fluid models in a nonlinear ballooning mode representation." In U.S.-Japan workshop on ion temperature gradient-driven turbulent transport. AIP, 1994. http://dx.doi.org/10.1063/1.44512.

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Shirai, H., T. Hirayama, Y. Koide, and M. Azumi. "Ion temperature profile simulation of JT-60 plasmas with ion temperature gradient mode transport models." In U.S.-Japan workshop on ion temperature gradient-driven turbulent transport. AIP, 1994. http://dx.doi.org/10.1063/1.44529.

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Olsen, Michael E., and Randolph P. Lillard. "Turbulent Axial Odometer Model." In AIAA Aviation 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-2963.

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Wang, Fang, Yong Huang, and Tian Deng. "Simulation of Turbulent Combustion Using Various Turbulent Combustion Models." In 2009 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2009. http://dx.doi.org/10.1109/appeec.2009.4918759.

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GAWȨDZKI, KRZYSZTOF. "Simple models of turbulent transport." In XIVth International Congress on Mathematical Physics. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812704016_0005.

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Reports on the topic "Turbulentné modely"

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Cranfill, C. W. A new multifluid turbulent-mix model. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/465874.

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Dechant, Lawrence. Approximate Model for Turbulent Stagnation Point Flow. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1235211.

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Dechant, Lawrence J. Turbulent Spot Pressure Fluctuation Wave Packet Model. Office of Scientific and Technical Information (OSTI), May 2017. http://dx.doi.org/10.2172/1367453.

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Kosaly, George, and J. J. Riley. Evaluation of Closure Models of Turbulent Diffusion Flames. Fort Belvoir, VA: Defense Technical Information Center, February 2000. http://dx.doi.org/10.21236/ada378388.

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Braun, Noah, and Robert Gore. A Turbulent Mix-Model for Re-stabilized Flows. Office of Scientific and Technical Information (OSTI), May 2021. http://dx.doi.org/10.2172/1784661.

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Ozgokmen, Tamay M. A Non-Fickian Mixing Model for Stratified Turbulent Flows. Fort Belvoir, VA: Defense Technical Information Center, September 2010. http://dx.doi.org/10.21236/ada542575.

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Ozgokmen, Tamay M. A Non-Fickian Mixing Model for Stratified Turbulent Flows. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada601520.

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Ozgokmen, Tamay M. A Non-Fickian Mixing Model for Stratified Turbulent Flows. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada590696.

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Michalski, A,, D. Andersson, R. Rossi, and C. Soriano. D7.1 DELIVERY OF GEOMETRY AND COMPUTATIONAL MODEL. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.020.

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This document describes the industrial application, on which the developments of the project are implemented, and the CFD set-up. The developments are implemented over six analysis cases with increasing complexity starting from a 2D geometry with mean wind inflow to a 3D geometry with turbulent inflow and real-time shape optimization. The application represents the CAARC tall building model, which has served as a benchmark model for many studies since the 1970’s when it was first developed. Base moments (bending and torsional moments) of the building are extracted for validation by comparison of the results with the benchmark study. Page 3 of 19 Deliverable 7.1
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Mukerji, S., J. M. McDonough, M. P. Menguec, S. Manickavasagam, and S. Chung. Chaotic map models of soot fluctuations in turbulent diffusion flames. Office of Scientific and Technical Information (OSTI), October 1998. http://dx.doi.org/10.2172/676978.

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