[Jey]

Hi,

I am running a simple analysis on a flow over a race car.
This is just a preliminary analysis and hence I am using the standard ke turbulence model with default CD ADAPCO parameters.

All my residuals look OK except for Tdr (Turb. Dissipation rate) and Tke (Turb. Kinetic Energy) residuals.

The Tdr and Tke are of 10e-2 order.

Should we be worried about this?
If so, how can we reduce the Tdr and Tke residuals ?

Any advice is much appreciated. Advance Thanks,
Jey

[Maddin]

Look for the monitor. The residuals are normalized.

[Vinicius]

You don´t need to worry about that. These residuals are normalized, so you need to monitor another variables such as pressure, drag force, mass flows... When they stabilize your simulation is converged.

[ong khi]

Originally Posted by Vinicius

You don´t need to worry about that. These residuals are normalized, so you need to monitor another variables such as pressure, drag force, mass flows... When they stabilize your simulation is converged.

Hi, i am struggling with the convergence problems too. If Tke and Tdr are normalized, I can just ignore them? and only concentrating on monitoring the stabilization of other variables?

Thanks in advance!

[karahan]

In my opinion, all of the residuals must decrease at least to the order of 10e-4.

Please correct me if I am wrong.

[ashokac7]

Originally Posted by karahan

In my opinion, all of the residuals must decrease at least to the order of 10e-4.

Please correct me if I am wrong.

Residual for energy of order of E-7 are considered converged.

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[wxs9872002]

Maybe try SST K-Omega model.

[karahan]

Originally Posted by karahan

In my opinion, all of the residuals must decrease at least to the order of 10e-4.

Please correct me if I am wrong.

Residuals are normalized with respect to some defined initial iterations. It is not a must, that they decrease a certain order of magnitude. The important thing is, that they become somewhat stable, which meanse that the solution is stable. This is also valid the for other field variables of the flow.