A carregar...
Publicação
Impacto de Modelos de TurbulĂȘncia no Estudo AerodinĂąmico do Corpo de Ahmed
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.5 MB | Adobe PDF |
Orientador(es)
Resumo(s)
A simulação numérica é uma componente muito importante no desenvolvimento da In-
dĂșstria AutomĂłvel pelo que Ă© necessĂĄrio que esta seja o mais fiel possĂvel Ă realidade. A reali-
zação de estudos numéricos permite uma redução de custos financeiros e temporais relativa-
mente aos estudos experimentais.
A escolha do modelo de turbulĂȘncia a utilizar nos estudos aerodinĂąmicos Ă© crucial para
se obterem resultados mais precisos, ou seja, com um menor erro. Uma maior precisĂŁo dos
estudos numéricos origina melhores resultados o que pode levar a que os estudos experimentais
tenham o propĂłsito Ășnico de validação de resultados.
Nesta dissertação estudou-se o escoamento em torno do corpo de Ahmed tridimensional
recorrendo a quatro modelos de turbulĂȘncia RANS com o objetivo de determinar qual o mais
adequado para utilizar em estudos aerodinĂąmicos da IndĂșstria AutomĂłvel. Recorreu-se ao pro-
grama Simcenter STAR-CCM+ desenvolvido pela Siemens Digital Industries Software para a
realização de todo o trabalho computacional desta dissertação.
De entre os modelos de turbulĂȘncia Standard Spalart-Allmaras, Realizable đ â đ Two-
Layer, SST đ â đ e RSM o que se revelou mais preciso, por comparação com dados experi-
mentais, foi o modelo RSM. Este obteve o menor erro relativo percentual no cĂĄlculo do Coefi-
ciente de Arrasto.
Numerical studies are a very important component in the development of the Automotive Industry, therefor is necessary that these are as faithful to reality as possible. Carrying out nu- merical studies allows a reduction in financial and time costs compared to those of experimental studies. The choice of the turbulent model to use in aerodynamic studies is crucial to obtain the most accurate results, that is, with the smallest error. Greater accuracy in numerical studies leads to better results, which can lead to experimental studies having solely the purpose of validating results. The flow around a three-dimensional Ahmed-Body was studied in this dissertation using four RANS turbulent models with the objective of determining which one is the most adequate for aerodynamic studies in Automotive Industry. The Siemens Digital Industries Software pro- gram STAR-CCM+ was used for all the computational work done in this dissertation. Among the turbulent models Standard Spalart-Allmaras, Realizable đ â đ Two-Layer, SST đ â đ and RSM the one proved to be more accurate, in comparison with experimental data, was RSM. This obtained the lowest percentage relative error in calculating the Drag Co- efficient.
Numerical studies are a very important component in the development of the Automotive Industry, therefor is necessary that these are as faithful to reality as possible. Carrying out nu- merical studies allows a reduction in financial and time costs compared to those of experimental studies. The choice of the turbulent model to use in aerodynamic studies is crucial to obtain the most accurate results, that is, with the smallest error. Greater accuracy in numerical studies leads to better results, which can lead to experimental studies having solely the purpose of validating results. The flow around a three-dimensional Ahmed-Body was studied in this dissertation using four RANS turbulent models with the objective of determining which one is the most adequate for aerodynamic studies in Automotive Industry. The Siemens Digital Industries Software pro- gram STAR-CCM+ was used for all the computational work done in this dissertation. Among the turbulent models Standard Spalart-Allmaras, Realizable đ â đ Two-Layer, SST đ â đ and RSM the one proved to be more accurate, in comparison with experimental data, was RSM. This obtained the lowest percentage relative error in calculating the Drag Co- efficient.
Descrição
Palavras-chave
Estudos NumĂ©ricos IndĂșstria AutomĂłvel Corpo de Ahmed Modelos de TurbulĂȘncia RANS Simcenter STAR-CCM+