Learning Forum

[SB]

Hello,

I have a small problem to implement a buoyancy force term to the z momentum.

I’m modelling laser melting. The buoyancy model is activated.

I'm facing problems to implement a buoyancy force term to the z momentum.

There are three-momentum source to freeze the Fluid below a certain temperature to achieve material melting due to laser heat source and they are working just fine, without a buoyancy force term Fb. 

If I run the case with the Fb term, which is defined as follows, an error is happening.

I plotted the CEL expression in CFX pre over the whole possible data range, without any error.

Everything in the equation is defined, but I get still this error:

I don’t understand why the error is happening. I don’t see the error.

 

With best regards

Steffen B

[rfblumen]

It's not clear what the exact problem is.  Since this is happening at the first coefficient loop at t=0, it may have something to do with initialization of the SteelSolidLiquid temperature field.  You could try running a steady-state version of the model 1-2 iterations and try initializing the transient model from that steady-state solution to see if this resolves the issue.  If not, you'll need to submit a service request to allow Ansys Support to look into it further.