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March 2, 2015, 15:53 |
Using PT Outlet Profile as Inlet BC
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#1 |
New Member
Brian
Join Date: Feb 2015
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Hello,
I have a total pressure outlet profile that I'd like to use as the inlet boundary condition for another case. The issue is that the meshes are completely different. Ideally I'd like to use a circumferentially-averaged PT profile as the inlet BC but it seems this isn't possible in CFX. What is the best way of going about this? Thanks for any help you can give me. |
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March 2, 2015, 16:38 |
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#2 |
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Ghazlani M. Ali
Join Date: May 2011
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In CFD-post, you can export a boundary profile, then use it as inlet boundary profile in CFX. Basically you will use, the "file - > export" function in cfd-post, then "tools -> initialize profile data" in CFX. For a mass flow for examples, the variable is dependent on x,y,z. I SUPPOSE even if your mesh changes but its position did not change, it can work... Hope it can help
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March 2, 2015, 16:43 |
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#3 |
Senior Member
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Complementing diamondx response, if your case is a turbo machine you can use TurboPost do compute the circumferentially averaged profile. Such profile is radial only now, correct ?
You can then export as diamondx explained your radial profile, and use it in CFX-Pre as usual. |
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March 2, 2015, 16:47 |
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#4 | ||
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Brian
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Quote:
Quote:
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March 2, 2015, 18:25 |
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#5 | |
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Brian
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March 2, 2015, 18:41 |
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#6 |
Senior Member
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Not sure what your goal of using the profile of the outlet as the inlet profile for the next simulation is ? If you average the profile on both directions: circumferential and span, you may as well put a uniform value that ballpark the average you want. Then, there is no need for exporting/importing.
The idea of using profile from one simulation to another is to keep as much information as possible from the "real distribution upstream" instead of guessing a distribution downstream. |
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March 3, 2015, 06:09 |
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#7 |
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Thomas MADELEINE
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Hi all,
just to add some little thing to the discussion when you import a profile for a boundary it is read as a function (XxYxZ -> value) so it is interpolated betwen each point you give (your ancient mesh) and read to your new mesh moreover if you know the change you have done in your geometry you can adjust your profile quite easily in the BC setup: just replace X,Y,Z by the value you want or create new variable to match the old profile with the new BC, exemple: X0 = X*cos(theta) + Y*sin(theta) I suppose it works the same in the Turbo module |
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March 4, 2015, 14:02 |
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#8 | |
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Brian
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Quote:
For future reference of anyone who finds this thread: this was possible to do using the Hub to Shroud Turbo Chart using the streamwise location mode. |
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March 4, 2015, 14:12 |
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#9 | |
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Brian
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March 4, 2015, 23:13 |
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#10 |
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I think you are confusing mesh coordinates with turbo coordinates. Once you obtain the spanwise profile by circumferentially averaging the previous solution, what you really have is a f(x,y,z) that when plotted show circumferential bands, but still a function of x,y,z on the surface.
Just export the spanwise profile you got as a (x,y,z) function, and import it in CFX-Pre. Once you hook it up on your inlet, you can visualize what you got and I bet you will see the spanwise distribution you expect. |
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cfd, cfx, profile boundary cond. |
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