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Laminar simulation using air as a working fluid

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Old   February 28, 2019, 08:06
Default Laminar simulation using air as a working fluid
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Hello friends,

I am doing three dimensional simulation of heat transfer for flow through uniform micro channel with air as a working fluid.

Pressure based solver/steady
I have switched on the energy equation..
convergence criteria is 10^-6
SIMPLE algorithm,
Pressure-second order
Momentum and energy-QUICK

but the solution was never converged...please help me if I did any mistake regarding the simulation with air as working fluid....appreciate your help

Thanks in advance.
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Old   February 28, 2019, 08:11
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Dear goli92,

What do you mean by the solution never converged ? did you get any errors ? AMG divergence ?

Regards,
Annan
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Old   February 28, 2019, 08:15
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Quote:
Originally Posted by annan View Post
Dear goli92,

What do you mean by the solution never converged ? did you get any errors ? AMG divergence ?

Regards,
Annan
Thanks for prompt response

No errors but residuals are just oscillating....

for example continuity residual is like from 1e-1 to 9.8e-2 to 1e-1...

hope I am clear with my problem...if any clarification needed please let me know...any
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Old   February 28, 2019, 08:44
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What about your mesh ? quality and cell size ?

Have you tried running the simulation in unsteady ?
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Old   February 28, 2019, 23:51
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Quote:
Originally Posted by annan View Post
What about your mesh ? quality and cell size ?

Have you tried running the simulation in unsteady ?
Problem solved...I need to further refine the mesh....minimum quality is 0.21...and flow condition is steady state...

Thanks for your response.
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