The Reynolds number of a 3-D turbulent flow is 10^4. What is the number of time-steps needed?(a) 100(b) 1000(c) 10^4(d) 10^5I have been asked this question in a national level competition.Asked question is from Direct Numerical Solution for Turbulent Models topic in section Turbulence Modelling of Computational Fluid Dynamics

The Reynolds number of a 3-D turbulent flow is 10^4. What is the numbe

1.	The Reynolds number of a 3-D turbulent flow is 10^4. What is the number of time-steps needed?(a) 100(b) 1000(c) 10^4(d) 10^5I have been asked this question in a national level competition.Asked question is from Direct Numerical Solution for Turbulent Models topic in section Turbulence Modelling of Computational Fluid Dynamics
Answer» Correct CHOICE is (a) 100 Best explanation: The number of time steps depends on the ratio of the largest to the SMALLEST time scales. This ratio depends on the REYNOLDS number. The times steps needed is Re^1/2. Here, it is (10^4)^1/2, which is equal to 100. 100-time steps are needed to SOLVE this problem.

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