August 25, 2019, 16:09
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Under relaxation factors: Do they affect the end solution?
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#1
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New Member
Ramaswamy Devakottai
Join Date: Feb 2019
Posts: 9
Rep Power: 7
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Hello,
I am performing conjugate heat transfer CFD simulations for jet impingement.
Constant heat flux of 20,000 W/m^2 is provided at the base of the solid. The top of the solid is open to the fluid domain. The top of the solid domain has some protrusions.
- The heat flux measured on the top surface through the surface integral report was same as (area of bottom / area of top)*(heat flux at bottom). Is this how the value should be?
- When I change the under relaxation factor of energy to 0.8 (from 1), the heat flux value at surface is very low. Is there a specific way/calculation to implement the URFs?
What would be the source of error?
I would be able to provide more data if required.
Thanks.
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