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March 14, 2012, 11:37 |
Suction Boundary Condition
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#1 |
New Member
Akim Faisal
Join Date: Jan 2012
Posts: 18
Rep Power: 14 |
Hi,
I am trying to solve a problem in which the channel is rectangular and the bottom wall will have a suction, meaning the fluid near the bottom wall will go downward with a certain velocity. How would I specify such boundary condition in FLUENT? Thanks, Akim Last edited by Akim679; March 14, 2012 at 11:56. Reason: Typo |
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March 15, 2012, 09:40 |
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#2 |
Senior Member
Rick
Join Date: Oct 2010
Posts: 1,016
Rep Power: 26 |
Pressure outlet?
I'm not sure if you can set a mass flow inlet or a velocity inlet and then if you can specify a negative value... I'm not sure I understand your proble..post a picture. Daniele |
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March 15, 2012, 14:31 |
Porous wall
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#3 |
New Member
Akim Faisal
Join Date: Jan 2012
Posts: 18
Rep Power: 14 |
Actually,
My adviser told me to model a wall as a "porous wall" which will allow fluid to seep through. Is there a way to specify that in FLUENT? Thanks, Akim |
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March 16, 2012, 00:04 |
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#4 |
Member
Join Date: Mar 2011
Posts: 50
Rep Power: 15 |
put ur suction boundary as pressure outlet
write a udf using DEFINE_PROFILE and place it on this boundary..should work I am doing the same thing except my boundary is oscillating suction and injection. |
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March 16, 2012, 11:30 |
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#5 |
New Member
Akim Faisal
Join Date: Jan 2012
Posts: 18
Rep Power: 14 |
Would you kindly elaborate on writing the UDF on the "DEFINE_PROFILE". I'm not too sure on UDFs.
Thanks, Akim |
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March 16, 2012, 12:07 |
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#6 |
Member
Join Date: Mar 2011
Posts: 50
Rep Power: 15 |
/************************************************** ********************/
/* unsteady.c */ /* UDF for specifying a transient velocity profile boundary condition */ /************************************************** ********************/ #include "udf.h" DEFINE_PROFILE(SJ_velocity, thread, position) { face_t f; begin_f_loop(f, thread) { real freq=25.; real vol=400.; real spd=vol/520.; real t = RP_Get_Real("flow-time"); F_PROFILE(f, thread, position) = spd*sin(freq*(t-0.075)*(2.*3.141592654)); } end_f_loop(f, thread) } |
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May 10, 2018, 14:53 |
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#7 |
New Member
Msvs
Join Date: Apr 2018
Posts: 7
Rep Power: 8 |
could u explain it more easier way to understand . it would very nice of you if u could
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