Fluent profile reading for another solution

ozgulo · January 5, 2016, 10:02

Hello all,
I need help with a problem. I have an aircraft simulation series. The main geometry is the same: same fuselage same wing with little differences, i.e. aileron angle, flap etc.

The fuselage is very detailed and the mesh size is quite big as is. I want to use the results from a full size analysis and solve the other ones with smaller mesh, without using fuselage and farfield.

I have written a profile for the cross-section I want from the full-size analysis result and read it into the new mesh boundary. However, what boundary type should I use for this? If I use pressure inlet, I can specify pressure and temperature but velocity directions are off. Velocity-inlet does not work at all (absurd pressure values).

Is this doable? How can I do it?

Btw, it is compressible flow, k-w SST 0.2 Mach.

LuckyTran · January 6, 2016, 15:44

If you want to specify as many parameters as possible then you should be using velocity inlet and specifying, x,y,z velocity, temperature, and turbulence.

jpina · January 7, 2016, 04:35

Hello,

I'm facing someway the same problem and I have the following problem:

http://www.cfd-online.com/Forums/flu...-attached.html

Maybe it inspires you... I'm using velocity inlet and a UDF which interpolates values from the macro simulation for setting the velocity in the coordinates x and y.

Thanks!

ozgulo · January 22, 2016, 07:26

Thanks for the replies guys. Sorry, urgent jobs came in the way and i couldn't reply quickly.
I will try and play around a bit with velocity inlet but will it be numerically correct? I mean my flow is compressible and fluent says velocity inlet is not very good for comp. flows.

January 5, 2016, 10:02	Fluent profile reading for another solution	#1
ozgulo New Member Ozge Join Date: Dec 2011 Posts: 4 Rep Power: 14	Hello all, I need help with a problem. I have an aircraft simulation series. The main geometry is the same: same fuselage same wing with little differences, i.e. aileron angle, flap etc. The fuselage is very detailed and the mesh size is quite big as is. I want to use the results from a full size analysis and solve the other ones with smaller mesh, without using fuselage and farfield. I have written a profile for the cross-section I want from the full-size analysis result and read it into the new mesh boundary. However, what boundary type should I use for this? If I use pressure inlet, I can specify pressure and temperature but velocity directions are off. Velocity-inlet does not work at all (absurd pressure values). Is this doable? How can I do it? Btw, it is compressible flow, k-w SST 0.2 Mach.

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January 6, 2016, 15:44		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	If you want to specify as many parameters as possible then you should be using velocity inlet and specifying, x,y,z velocity, temperature, and turbulence.

January 7, 2016, 04:35		#3
jpina Senior Member Jordi Pina Join Date: Mar 2015 Posts: 157 Rep Power: 11	Hello, I'm facing someway the same problem and I have the following problem: http://www.cfd-online.com/Forums/flu...-attached.html Maybe it inspires you... I'm using velocity inlet and a UDF which interpolates values from the macro simulation for setting the velocity in the coordinates x and y. Thanks!

January 22, 2016, 07:26		#4
ozgulo New Member Ozge Join Date: Dec 2011 Posts: 4 Rep Power: 14	Thanks for the replies guys. Sorry, urgent jobs came in the way and i couldn't reply quickly. I will try and play around a bit with velocity inlet but will it be numerically correct? I mean my flow is compressible and fluent says velocity inlet is not very good for comp. flows.