Initialize Profile Data Variables

aero_head · April 24, 2021, 20:56

Hello Everyone,

Just wanted to confirm something;

I have to initialize velocity profile data as the initial condition for my simulation.

I just wanted to know which coordinates the velocity components belong to i.e. velocity u = X direction, velocity v = Y direction, velocity w = Z direction or streamwise= vel u, wall normal= vel v, spanwise= vel w. I looked in the documentation CFX-Solver Modelling Guide, p.102 of Release 16.0, which seems to suggest it is the former case i.e. velocity u = X direction, etc.

In my case, I have Z as my streamwise directional coordinate, so I ran it with my velocity values as vel w and the initial results seem reasonable, but I have trust issues with myself and wanted to see what the verdict was on here.

ghorrocks · April 24, 2021, 21:49

Velocity u = X, Velocity v = Y, Velocity w = Z is correct.

aero_head · April 24, 2021, 22:36

Thank you so much for your reply, Glenn! That clears it up for me, much appreciated!

aero_head · April 25, 2021, 15:17

Oh, one other thing I just thought of; Say my inlet is at 0 and my outlet is at -1. Would it make sense for the velocity w values to get initialized with negative values?

ghorrocks · April 25, 2021, 18:14

Yes, that is fine.

aero_head · April 25, 2021, 19:07

Thank you so much again, Glenn!

April 24, 2021, 20:56	Initialize Profile Data Variables	#1
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 8	Hello Everyone, Just wanted to confirm something; I have to initialize velocity profile data as the initial condition for my simulation. I just wanted to know which coordinates the velocity components belong to i.e. velocity u = X direction, velocity v = Y direction, velocity w = Z direction or streamwise= vel u, wall normal= vel v, spanwise= vel w. I looked in the documentation CFX-Solver Modelling Guide, p.102 of Release 16.0, which seems to suggest it is the former case i.e. velocity u = X direction, etc. In my case, I have Z as my streamwise directional coordinate, so I ran it with my velocity values as vel w and the initial results seem reasonable, but I have trust issues with myself and wanted to see what the verdict was on here.

April 24, 2021, 21:49		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Velocity u = X, Velocity v = Y, Velocity w = Z is correct. aero_head likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

April 25, 2021, 18:14		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Yes, that is fine. aero_head likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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April 24, 2021, 22:36		#3
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 8	Thank you so much for your reply, Glenn! That clears it up for me, much appreciated!

April 25, 2021, 15:17		#4
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 8	Oh, one other thing I just thought of; Say my inlet is at 0 and my outlet is at -1. Would it make sense for the velocity w values to get initialized with negative values?

April 25, 2021, 19:07		#6
aero_head Senior Member Kira Join Date: Nov 2020 Location: Canada Posts: 435 Rep Power: 8	Thank you so much again, Glenn!