Different results for same simulation

edwarddjr · November 26, 2017, 15:14

Hello,
I am running the exact same model & parameters (basically the same simulation) without any changes at all. Basically, run today, close the thing, come back tomorrow, run again the same thing and I get two different answers. Anybody know any reason why that could be? Thanks in advance.

LauraSumner · April 4, 2018, 09:38

hey did you ever find out why this was happening? Having the same issue myself!

Laura

e_cfd · April 5, 2018, 07:16

What are your boundary conditions? What is the coupling method (velocity-pressure)?

BlnPhoenix · April 6, 2018, 04:37

I suspect the simulations are not set up identical or the simulation itself has some kind of randomnes implemented. If the first thing can be ruled out entirely, i would help to know the simulation approach e.g. DNS, LES, RANS, URANS, BC's etc.

November 26, 2017, 15:14	Different results for same simulation	#1
edwarddjr New Member Edward Join Date: Nov 2017 Posts: 1 Rep Power: 0	Hello, I am running the exact same model & parameters (basically the same simulation) without any changes at all. Basically, run today, close the thing, come back tomorrow, run again the same thing and I get two different answers. Anybody know any reason why that could be? Thanks in advance.

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April 4, 2018, 09:38		#2
LauraSumner New Member Laura Sumner Join Date: Mar 2017 Posts: 13 Rep Power: 9	hey did you ever find out why this was happening? Having the same issue myself! Laura

April 5, 2018, 07:16		#3
e_cfd Member ehsan Join Date: Sep 2014 Posts: 38 Rep Power: 11	What are your boundary conditions? What is the coupling method (velocity-pressure)?

April 6, 2018, 04:37		#4
BlnPhoenix Senior Member Join Date: Aug 2014 Location: Germany Posts: 292 Rep Power: 13	I suspect the simulations are not set up identical or the simulation itself has some kind of randomnes implemented. If the first thing can be ruled out entirely, i would help to know the simulation approach e.g. DNS, LES, RANS, URANS, BC's etc.