RANS for transient simulation? -- CFD Online Discussion Forums

July 4, 2017, 03:40	RANS for transient simulation?	#1
CellZone Member Join Date: Apr 2016 Posts: 90 Rep Power: 10	Hi, I am wondering if I can use the RANS for transient simulations? Because I take the average of the velocity component over time? But if I can take a very small time step for RANS, then it should be possible to use it for transient simulations? But when I reduce Delta t -- > then the sense of RANS (to not calculate all fluctuations) would be lost? There is already a thread RANS and URANS. but I do not understand why RANS should not be a time average method? By the way, how can I picture out "ensemble average" comparing to "time average"? Thank you guys

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