Domain independent test

ganesh chakravarthi · August 19, 2015, 03:30

Hii everyone,

Presently I am doing problem on fluid flow analysis.. In my problem I have taken car as my model..
I have small doubt in order to create fluid flow region I.e,domain..
I mean on what basis I have to create my domain- is this based on length and size of my model or anything else??
Is there anything word like this DOMAIN INDEPENDENT TEST..if yes what is the use of it..please help me..

ghorrocks · August 19, 2015, 05:51

Yes, an important check for a CFD model is that your boundaries are sufficiently far away (assuming you are trying to model a far-field condition) to not significantly affect results. Performing a sensitivity analysis on boundary condition proximity is a really good idea.

I also recommend reading the literature as published CFD models should specify how big a domain they used - this can give you a guide. But be careful that different CFD methods require different boundary proximities, and some authors may accept a different amount of boundary proximity induced error than you can.

August 19, 2015, 03:30	Domain independent test	#1
ganesh chakravarthi New Member ganesh chakravarthi Join Date: Apr 2014 Posts: 14 Rep Power: 12	Hii everyone, Presently I am doing problem on fluid flow analysis.. In my problem I have taken car as my model.. I have small doubt in order to create fluid flow region I.e,domain.. I mean on what basis I have to create my domain- is this based on length and size of my model or anything else?? Is there anything word like this DOMAIN INDEPENDENT TEST..if yes what is the use of it..please help me..

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August 19, 2015, 05:51		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Yes, an important check for a CFD model is that your boundaries are sufficiently far away (assuming you are trying to model a far-field condition) to not significantly affect results. Performing a sensitivity analysis on boundary condition proximity is a really good idea. I also recommend reading the literature as published CFD models should specify how big a domain they used - this can give you a guide. But be careful that different CFD methods require different boundary proximities, and some authors may accept a different amount of boundary proximity induced error than you can.