## Fluids

#### how can I calculate the Reynolds number of the flow inside computer domain?

• abd fs
Subscriber

Dear researchers, I am simulating an unsteady turbulent flow (ideal gas) in complex geometry, and I want to calculate the Reynolds number of the flow. At the entrance of the field, a pressure of 0.25MPa, is imposed. My question is: how can I calculate the Reynolds number of the flow inside computer domain?

Best regards,

SERRAR

• Rob
Ansys Employee
Treat the solver result in exactly the same way you would experimental data. How would you do the calculation there?
• abd fs
Subscriber
Dear Rob I have no experimental data, I only have the results digitally simulated by Fluent.
If possible, do you have any recommendations for finding the Reynolds number?
Best regards
• Rob
Ansys Employee
Which are a simulation of a real system. In the real system how would you calculate Reynolds Number?
• abd fs
Subscriber
Dear Rob Thank you very much for your quick responses. I want to share with you my domain of computation to give you a vision of what I'm talking about.
Best regards
• Rob
Ansys Employee
• abd fs
Subscriber
Dear Rob Since you can't open the image, you can just type sweeping jet on google and you will find what I have researched.
Thank you so much for your help Best regards SERRAR
• YasserSelima
Subscriber
Here it is. Next time,just drag and drop the picture .. or use the photo icon at the bottom.

• abd fs
Subscriber
Dear Yasser
Do you have any idea how can I calculate the number of Reynolds?
Best regards SERRAR
• YasserSelima
Subscriber
Re number is used for comparison between similar cases at different scale and flow conditions. So, I would look in the literature for similar case .. if nothing is found, I would calculate it at the entrance
• abd fs
Subscriber
Thank you so much for your help, Mr Yasser
• YasserSelima
Subscriber
You are welcome!
• Rob
Ansys Employee
Ah, a bi-stable fluidic oscillator. Make sure your mesh is VERY good.
• abd fs
Subscriber
Dear Rob Since I have a complex domain, I have divided it into several subdomains, which increases the quality of the network.
Beste regards SERRAR