Reynolds and Nusselt numbers

how can I calculate in CHT Reynolds and Nusselt numbers?
I mean, Can Simscale calculate them automatically?


For the Reynolds number, you would need to perform the hand calculation locally.

As far as the Nusselt number goes, you can do that with a “Wall heat flux” field calculation result control for a CHTv2 analysis type (CHTv1 is not supported).


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Reference length?
is it the length of cooling channel? why not diameter?

The reference (or characteristic) length is just a length that represents the geometry. It doesn’t necessarily need to be the actual “length” of the channel if something else makes more sense.

Geometry? Inlet or length of geometry?

Hopefully this helps: Characteristic length - Wikipedia