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June 28, 2016, 17:10 |
Velocity profile boundary condition at inlet
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#1 |
Member
Sheikh Ahmed
Join Date: Dec 2015
Location: South Carolina, USA
Posts: 88
Rep Power: 10 |
Hello Foamers
I have a basic question of which you probably know the answer- suppose I have a radial velocity profile, say a fully-developed parabolic velocity profile, and I want to use this profile as my inlet boundary condition. How can I add this profile as my boundary. This can be by reading magU Vs. Z values from a file, or by reading a parabolic function (z-dependent) or by any other way. I am quite sure someone of us used this or similar boundary in his/her works. Please suggest me to figure out this. Thanks in advance. |
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June 29, 2016, 03:51 |
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#2 | |
New Member
Justin Wiegmann
Join Date: Aug 2015
Posts: 20
Rep Power: 11 |
Quote:
It is quite easy with groovyBC from swak4Foam package, which you could download here. The BC could then looks like (parabolic with velocity in x-direction): Code:
Inlet { type groovyBC; value uniform (1 0 0); variables "Um=1; ypos=pos().y; zpos=pos().z; h=-max(pts().z); c1=-Um/(h*h); c2=Um;"; fractionExpression "1"; valueExpression "vector(c1 * ((ypos*ypos)+(zpos*zpos)) + c2, 0, 0)"; } Regards JW |
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inlet boundary condition, parabolic function, velocity profile |
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