Question

The transport equation in the Spalart-Allmaras model is for the transport of ___________

(a) kinematic eddy viscosity parameter

(b) kinematic eddy viscosity

(c) dynamic eddy viscosity parameter

(d) dynamic eddy viscosity

I had been asked this question in a national level competition.

The query is from Turbulence Modelling in section Turbulence Modelling of Computational Fluid Dynamics

Answer 1

The correct answer is:

(a) kinematic eddy viscosity parameter

Explanation:

In the Spalart-Allmaras turbulence model, the transport equation is for the kinematic eddy viscosity parameter, often denoted as ν~\tilde{\nu}ν~. This model simplifies the turbulence modeling process by introducing a single transport equation for this parameter, which is related to the turbulence viscosity and used to represent the effects of turbulence in a flow field. It is a popular model for wall-bounded flows, particularly in aerospace and automotive applications.