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June 5, 2012, 20:32 |
residuals
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#1 |
Member
David L
Join Date: May 2012
Posts: 43
Rep Power: 13 |
I have a pipe with heat flux outside and I select for the picture 2 K-epsilon turbulence and the picture 1 Reynolds Stress Turbulence. wath do you think about the Residuals? are it good? or I nedd more iteration? when will I get the best solution? I am new with cfd.
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June 5, 2012, 20:38 |
Nusselt Number
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#2 |
Member
David L
Join Date: May 2012
Posts: 43
Rep Power: 13 |
I have a pipe with heat flux outside, I have a line of point inside the pipe with a fluid, I should have the temperature the pressure and de Nusselt Number, but for temperature and pressure I have normal result but in the case of Nusselt Number my values are always 0. anyone know what is happening? we can see the pictures.
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June 6, 2012, 14:32 |
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#3 |
Senior Member
siamak rahimi ardkapan
Join Date: Jul 2010
Location: Copenhagen, Denmark
Posts: 220
Rep Power: 17 |
To make sure which model ( k-epsilon or reynolds ) is proper, you need to evaluate by
1- a real case that exist and you can check some values, such as velocity and compare with the simulation. 2- or check some specific numbers such as drag coefficient in some place of the flow. What is the reason that the continuity is not converged in the simulation? |
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June 6, 2012, 16:06 |
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#4 |
Member
David L
Join Date: May 2012
Posts: 43
Rep Power: 13 |
I can check with the outlet and inlet of the temperature and pressure, or calculate the velocity.
with both I have good result of the pressure (inlet and outlet) but with both outlet temperarure changes 10 ºC-20 ºC which depends the model. I do not have idea why the continuity is not converged in the simulation? could you tell me something about Nusselt Number? |
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