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May 4, 2013, 20:02 |
Convergence in Free convection
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#1 |
New Member
Join Date: Oct 2011
Posts: 19
Rep Power: 14 |
Hi all,
I am new user of ANSYS/FLUENT 14.0, sometime i am running simulation of natural convection with boussinesq approximations for density, the simulations is going on with no error, residuals decreases rapidly at start and then constant. so i am confused that either i need to run for more iterations or it will not converge at all. please guide |
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May 5, 2013, 07:08 |
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#2 | |
Senior Member
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Quote:
could you pease upload your mesh system, and what is the Ra number. |
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May 5, 2013, 13:00 |
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#3 |
New Member
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Posts: 19
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All residuals decreases quickly to value close to convergence but then constant, means no further decrease. The mesh is simple rectangular box, with three walls adiabatic q''=0, and one side heating wall. Is there a role of Ra number to simulate natural convection. Also gravity value at -0.0098 gave convergence but when i increased it to -0.098 or -0.98, -9.8, situation is like i told.
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May 5, 2013, 21:04 |
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#4 | |
Senior Member
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Quote:
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May 6, 2013, 18:22 |
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#5 |
New Member
Join Date: Oct 2011
Posts: 19
Rep Power: 14 |
Thanks, i decreased the mesh size and now its working, one more thing is that when i am using velocity inlet BC for natural convection flow with very small value 10^-m/s, its working but when i am using pressure inlet BC which is preferred with natural convection flow, its not converging with constant wall T & q''. Do u suggest me something to run it.
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