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How to create velocity profile using the previous time step ones |
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#1 |
New Member
fangming
Join Date: May 2011
Posts: 3
Rep Power: 15 ![]() |
Dear all,
I am doing a large eddy simulation case, and I run into a trouble to define inlet conditions, explicitly the turbulent velocity. The turbulent velocity has such a formation: u'(t)=u'(t-delta_t)*exp(-t/T). For u'(t) is not a direct function of time, it causes a great pain to rebuild such a inlet turbulent velocity for me. I tried a lot using groovyBC of swak4FOAM, used to extract the previous time step value of u@inlet but failed. I wondering anyone can help me out. Considering my poor skill using swak4FOAM and little experience with openFOAM, I hope I did not propose a stupid questions! Thank you in advance! Great regard and best wishes! |
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#2 | |
Assistant Moderator
Bernhard Gschaider
Join Date: Mar 2009
Posts: 4,225
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#3 | |
New Member
fangming
Join Date: May 2011
Posts: 3
Rep Power: 15 ![]() |
Quote:
Thanks for your quick reply,Bernhard. Thanks very much! Okay, well, it's time for me to improve my English. I am sorry for my vague expressions. What I really want to do is using the old time step value of U at inlet to construct a "new" U for the new time step at the same inlet patch. I am not quite familar with the OpenFOAM variable and swak4FOAM functions and tried and failed may times. It is excited to hear your news! May be I can download it and try this new feature. Great regards and best wishes! |
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Tags |
previous timestep, time dependent velocity, velocity inlet |
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