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Reynolds Number in Micro Diffusers-Nozzle

Posted 9 dic 2014, 12:09 GMT-5 Fluid & Heat, Computational Fluid Dynamics (CFD), Microfluidics, Results & Visualization Version 4.4 0 Replies

Marwan Nafea
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Hi All,

What is the suitable formula to be used to calculate Reynolds number in a micro diffuser-nozzle structure, as the picture attached?

I am using:
Reynolds number = hydraulic diameter*density*velocity/dynamic viscosity

When I go up to Re = 100 I keep getting an error telling me:

"Failed to find a solution. Maximum number of Newton iterations reached. Returned solution is not converged."

How can I solve that?

Thanks.
Marwan

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0 Replies Last Post 9 dic 2014, 12:09 GMT-5
COMSOL Moderator

Hello Marwan Nafea

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