sqitch off one component velocity CFX

ivanklok · June 7, 2009, 17:07

Is it possible to swith off one-component velocity equation in CFX, translating formally 3D domain to 2D?

ckleanth · June 7, 2009, 19:17

as far as I know cfx wont dont do 2d simulation and you cant partialy disable the hydrodynamics equations. the only way I know to perform 2d simulations in cfx you need to make a 2d mesh using cfx-mesh

ghorrocks · June 8, 2009, 07:51

Hi,

You do it most easily by making a domain one element thick and putting symmetry planes on both sides. This ensures the flow is 2D (as flow cannot cross a symmetry plane) but the solver still is solving the full 3D equations so there is a major memory and CPU time penalty there compared to a true 2D model.

There is no way of getting CFX to do a true 2D model. It has to be the most requested feature from the earliest days of the CFX5 family but it has never been done. All I can say is put in a feature request for it, and if you need to do lots of 2D work you should go to a different software such as Fluent or CFD-ACE which does do true 2D simulations.

Glenn Horrocks

June 7, 2009, 17:07	sqitch off one component velocity CFX	#1
ivanklok New Member Join Date: Jun 2009 Posts: 2 Rep Power: 0	Is it possible to swith off one-component velocity equation in CFX, translating formally 3D domain to 2D?

June 7, 2009, 19:17		#2
ckleanth Senior Member George Join Date: Mar 2009 Location: Birmingham, UK Posts: 257 Rep Power: 18	as far as I know cfx wont dont do 2d simulation and you cant partialy disable the hydrodynamics equations. the only way I know to perform 2d simulations in cfx you need to make a 2d mesh using cfx-mesh __________________ Top 4 tips 1. Knowledge is everything and Ignorance is dangerous. 2. Understand your limitations and try to eliminate them. 3. Get yerself a bike and hoon the chuffer. You will soon learn why dogs like to hang their heads out the car window. 4. Please before asking any questions on how to run simulations in CFX, go though all the tutorials

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June 8, 2009, 07:51		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Hi, You do it most easily by making a domain one element thick and putting symmetry planes on both sides. This ensures the flow is 2D (as flow cannot cross a symmetry plane) but the solver still is solving the full 3D equations so there is a major memory and CPU time penalty there compared to a true 2D model. There is no way of getting CFX to do a true 2D model. It has to be the most requested feature from the earliest days of the CFX5 family but it has never been done. All I can say is put in a feature request for it, and if you need to do lots of 2D work you should go to a different software such as Fluent or CFD-ACE which does do true 2D simulations. Glenn Horrocks