The Reynolds number of a 3-D turbulent flow is 10^4. What is the number of grid points needed?(a) 10^3(b) 10^4(c) 10^6(d) 10^9The question was posed to me during an online exam.I want to ask this question from Direct Numerical Solution for Turbulent Models topic in chapter 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 grid points needed?(a) 10^3(b) 10^4(c) 10^6(d) 10^9The question was posed to me during an online exam.I want to ask this question from Direct Numerical Solution for Turbulent Models topic in chapter Turbulence Modelling of Computational Fluid Dynamics
Answer» The correct ANSWER is (d) 10^9 The explanation: The ratio of the largest to the smallest LENGTH scale gives the number of grid points needed. The number of grid points needed in each direction is 10^3. The TOTAL number of grid points needed in all three DIRECTIONS (as the problem is 3-D) is 10^9.

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