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Advection Schemes option in NX Advanced Flow

I have calculated 140 [mbar] pressure drop across the cooling system using the default First-order advection schemes. Then I have calculated the same problem once more using the Second-order (SOU) advection scheme for the momentum equation. The second calculation yields 164 [mbar].

 

What pressure drop value to be committed to the customer?

Calculation using the Second-order (SOU) advection schemes for all RANS equations was not convergent.