Application of Les, Pans and Rans to a Case of Intake Channel Steady Flow Test Bench

Abstract

The paper deals with evaluation of intake channel flow properties (discharge coefficient, tumble and swirl ratio) using both 3-D CFD simulation and measurement. Sensitivity of different calculation parameters was tested. The most important ones are mesh parameters and applied turbulence models (considered models: LES, PANS and RANS). Concerning the mesh, the critical parameter is a mesh configuration near a wall - a thickness of mesh boundary layer and an amount of these layers have significant impact on mass flow rate while tumble/swirl ratio is unaffected by that. Based on that, these mesh parameters can be considered as tuning constants for fine-tuning the CFD model. Regarding the mesh cell size, 2 different values were tested (0.6 and 0.3 mm). It was found out that neither mesh is fine enough to perform proper LES. Hence, PANS performance is close to RANS. Concerning the turbulence models, PANS seems to be the best one as it combines advantages of both LES and RANS. Generally speaking, mass flow rate prediction is relatively good while swirl/tumble one is more problematic as only qualitative agreement can be achieved.

Keywords

• Průtokový Součinitel
• Číslo Tečné Rotace
• Číslo Příčné Rotace
• Modelování Turbulence
• Les
• Pans
• Rans
• Discharge Coefficient
• Swirl Number
• Tumble Number
• Turbulence Modelling
• Les
• Pans
• Rans