Reynolds number CEL expression counter plot CFD post

Upa_upitas · August 26, 2024, 15:42

Hey,

I have the simulation of a bioreactor. I would like to show the counter plot of the reynolds number distribution across the fluid.

I saw that Reynold number is not a variable in CFD post but it can be calculated using a expression.

Does anyone know the equivalency of the Re equation for CFD post (CFX) variables names? How can it be calculated in each point of the fluid doamin?

Thank you

karachun · August 26, 2024, 16:18

Reynolds number is calculated for some section of model, not for all points like some scallar field. Reynolds formula use hydraulic diameter and bulk velocity.

If you want to know Re for your calculation you can set variables for density, dynamic viscosity, select some hydraulic diameter typical for your model and calculate average velocity at inlet or other cross section and calculate Re the same way as in handbook but you only get one value for your simulation.

August 26, 2024, 15:42	Reynolds number CEL expression counter plot CFD post	#1
Upa_upitas New Member Upa Join Date: Mar 2024 Posts: 25 Rep Power: 2	Hey, I have the simulation of a bioreactor. I would like to show the counter plot of the reynolds number distribution across the fluid. I saw that Reynold number is not a variable in CFD post but it can be calculated using a expression. Does anyone know the equivalency of the Re equation for CFD post (CFX) variables names? How can it be calculated in each point of the fluid doamin? Thank you

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August 26, 2024, 16:18		#2
karachun Senior Member Join Date: Nov 2015 Posts: 246 Rep Power: 12	Reynolds number is calculated for some section of model, not for all points like some scallar field. Reynolds formula use hydraulic diameter and bulk velocity. If you want to know Re for your calculation you can set variables for density, dynamic viscosity, select some hydraulic diameter typical for your model and calculate average velocity at inlet or other cross section and calculate Re the same way as in handbook but you only get one value for your simulation.