[maddy11]

Hi all,


I'm doing simulation of a supersonic cavity using k-omega SST model. Could someone please tell me how to set inlet as powerlawInletVelocity ? Please help!



Regards,
Maddy

[ssa_cfd]

you can generate a csv file with inlet height with corresponding inlet velocity and then use fixedprofile boundary condition

[maddy11]

Dear ssa,

Thanks for your kind reply. I have a few doubts. Basic doubts. I have generated mesh in Gambit.
Is it possible to get inlet patch elements and their cellcentres in Paraview? How to use the fixed profile BC? Im an OpenFoam beginner. Kindly elaborate please.

Regards,
Maddy

[pvita]

Have a look at groovyBC boundary condition. You can place it at your inlet patch and with help of functions pos() and pts() that provide vector fields with face-centers and vertices respectively construct your profile.

[maddy11]

Dear pvita,
I tried installation of swak4foam and got some installation errors. Thats why Im looking at other alternatives. Kindly help please.

Regards,
Maddy

[ssa_cfd]

https://www.youtube.com/watch?v=rfNYVqU1py4

[maddy11]

Absolutely helpful!!! Thanks a ton!!!

[maddy11]

Dear ssa,
I have just one more doubt. Hope you can help. Should I apply the velocity values to the cell centres ? If so, how do I get the cell centre coordinates in ParaView? Is it simply the cell data?

Regardss,
Maddy

[ssa_cfd]

not cell centres.. u give values based on the height. and openfoam interpolates it automatically.

[pvita]

@maddy11: Read carefully installation instructions of swak4Foam and its error messages. Make sure you have all prerequisites installed and swak4Foam is properly configured. swak4Foam is too beautiful to miss it out.

Example of the velocity inlet with the 1/7th profile and maximal velocity of 10 m.s-1 assuming that y=0 goes through the middle of the inlet patch:

inlet
{ 
    type        groovyBC;
    variables   "u_max=10;n=7;r=mag(pos().y);R=mag(max(pts().y));";
    valueExpression "vector(u_max*pow(1-(r/R),1./n),0,0)";
}