LES is preferred when _____________(a) the flow is compressible(b) the flow has a high Reynolds number(c) the flow is turbulent(d) the flow has heat transfersThe question was posed to me during an online interview.The query is from Large Eddy Simulation for Turbulent Models topic in section Turbulence Modelling of Computational Fluid Dynamics

LES is preferred when _____________(a) the flow is compressible(b) the

1.	LES is preferred when _____________(a) the flow is compressible(b) the flow has a high Reynolds number(c) the flow is turbulent(d) the flow has heat transfersThe question was posed to me during an online interview.The query is from Large Eddy Simulation for Turbulent Models topic in section Turbulence Modelling of Computational Fluid Dynamics
Answer» Correct choice is (b) the FLOW has a high REYNOLDS number The best explanation: Large Eddy Simulation (LES) method is useful to capture the large turbulent EDDIES. It is not as accurate as the DNS method and not computationally demanding. As high Reynolds number will have large eddies, it is PREFERRED when the flow has a high Reynolds number.

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