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fluent buoyancy flow

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Old   April 12, 2017, 05:42
Default fluent buoyancy flow
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zhouyu
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hello


I'm trying to simulate turbulent mixed convection in a enclosure.

the buoyancy force due to temperature is considered.

the boussinesq approximation was used.

the turbulent model was rng ke. the enhanced wall treatment was applied.


I had tried two ways to get a better solution:

1. first, set the gravitational acceleration as a small value(0.098), and solve the case with first-order. then change the gravitational acceleration to 9.8. finally, solve the case with higher-order scheme.

2. first, solve the velocity field without temperature, and after it convergence, solving the energy equation with the momentum equations together.

but it was hardly to get the convergence solution.

can anyone give me some advises?

thanks very much!
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Old   February 11, 2018, 18:46
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Yuehan
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I am having the same problem. I tried both the ways you mentioned but I still cannot obtain converged solution. Did you eventually solve the problem?

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Originally Posted by zhouyu View Post
hello


I'm trying to simulate turbulent mixed convection in a enclosure.

the buoyancy force due to temperature is considered.

the boussinesq approximation was used.

the turbulent model was rng ke. the enhanced wall treatment was applied.


I had tried two ways to get a better solution:

1. first, set the gravitational acceleration as a small value(0.098), and solve the case with first-order. then change the gravitational acceleration to 9.8. finally, solve the case with higher-order scheme.

2. first, solve the velocity field without temperature, and after it convergence, solving the energy equation with the momentum equations together.

but it was hardly to get the convergence solution.

can anyone give me some advises?

thanks very much!
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