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August 31, 2015, 04:28 |
3d velocity profile at velocity inlet
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#1 |
New Member
swetha prakash
Join Date: Jul 2015
Posts: 8
Rep Power: 11 |
hey all... i have to do a 3d simulation of a flow with velocity inlet. (i already have the 2d velocity inlet profile.) I am gonna have to read in the velocity profile at the inlet to do the simulation but i have no idea how to generate one. the flow is a turbulent velocity profile fully developed. i am not sure how to generate one.
is it like we have to give a user defined function in fluent or we can manually calculate it and edit the .prof file and read it in fluent. the question might be dumb. but i am not quite familiar with ansys fluent. thanks |
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August 31, 2015, 12:46 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,739
Rep Power: 66 |
I think the best way is to generate the profile using Fluent from a periodic simulation to get your fully developed velocity profile solution. Then export the profile at the periodic boundary (export the .prof file). Then import the profile onto your simulation. Actually you should also export/import the turbulence quantities (k, epsilon, omega,etc.) and any other important quantities (temperature,etc) since these are also needed at the inlet.
Even if you don't use Fluent to generate the profile, I still think the easiest way is to generate some type of .prof file and read it into Fluent. The .prof is just a table of x,y,z u,v,w,t,k,epsilon values. The .udf approach does not add any value or utility to defining the inlet velocity bc's. But make sure you also get the turbulence quantities, they are just as important as having the right velocity profile. |
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September 1, 2015, 01:38 |
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#3 |
New Member
swetha prakash
Join Date: Jul 2015
Posts: 8
Rep Power: 11 |
thank you sir.. but i actually have only the mean value of velocity at the inlet. are you suggesting that i use the mean value at the inlet in fluent for the flow and get the velocity profile and other turbulent quantities after running it and exporting the .prof file and then using it again as inlet condition?
still confused. |
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September 1, 2015, 02:10 |
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#4 | |
New Member
swetha prakash
Join Date: Jul 2015
Posts: 8
Rep Power: 11 |
Quote:
I am still not clear on what to do. thats why.. sorry.. |
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Tags |
3dimensional, profile generation, velocity |
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