Learning Forum

[greg.harrington]

I have a heated plate inside a box. The box enclosing the plate has a thickness of 0.055 inch and is cooled by natural convection on all 6 sides. The box is defined as the air volume around the plate offset by 50mm
If I set the HTC on all 6 sides of the box created by the air volume to a constant value like 5 W/m-K (a standard value for these problems) the model runs just fine.
If I set the HTC to "Use correlation" to and use 4 vertical sides, 1 top and 1 bottom then the model doesnt run and gives the error: "Solver initilization failed"

For the solver settings:
Flow Regime: Laminar
Include Gravity: ON
Radiation Model: OFF
X Velocity Initial condition: 0.01 m/s (Direction opposite gravity)
Use Model Based Flow Initialization: ON

Pressure Under-Relaxation: 0.70, Body Force Discretization scheme
Momentum Under-Relaxation: 0.30

All other solver settings are default.

 

 

[Rabindra Paul]

Hi Greg: Thanks for the question in the forum. Please double check the gravity direction and top/bottom/vertical selection in the correlations bc panel. I did check in a test model and did not see any issue. Please turn ON radiation as it is important for natural convection.

 

Hope this helps.