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June 8, 2013, 06:56 |
velocity is going beyond its initial value
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#1 |
Member
ankur
Join Date: May 2012
Location: India
Posts: 50
Rep Power: 14 |
Hey
This thread is related to the thread http://www.cfd-online.com/Forums/ope...r-channel.html Initially I was using the buoyantBoussinesqSimpleFoam solver to simulate air flow inside a heated rectangular channel or pipe. The velocity was 1 m/s at the inlet but it increased to 1.1 m/s as it approached the outlet. After that I have modified the simpleFoam solver and added T equation in it (Based on the guidelines given at http://openfoamwiki.net/index.php/Ho...ure_to_icoFoam) I am not so sure whether I have done it rightly or not, but it is running good. The problem is that the results are similar to buyoant solvers and not good. I m not able to understand the reason. Any suggestion? |
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June 8, 2013, 08:40 |
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#2 |
Senior Member
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
Posts: 1,266
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Dear ankur
whats wrong with velocity result? it may differ from initial condition and its not wrong at all , you may give a uniform velocity at inlet, but when it reaches outlet, velocity profile will be changed, it reduces near wall for no slip condition and get sharper at the middle plane and have a value more than 1 m/s, i think you should provide some plots here to show us what is wrong?
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June 8, 2013, 09:07 |
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#3 |
Member
ankur
Join Date: May 2012
Location: India
Posts: 50
Rep Power: 14 |
Hey nima sam
Thanks alot for your reply.. I think I got your point. It was silly from my side. I did not check the results (without temperature case) properly. I did it again and waited for more time. It is giving the same result as with the temperature. but the positive point is I understood how it happens now, and learned how to modify the solver Thanks alot..I think to have a mass balance velocity peaks at a certain point. |
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