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-   -   How to set Reynolds value in Ansys 14.0 (http://www.cfd-online.com/Forums/cfx/124030-how-set-reynolds-value-ansys-14-0-a.html)

ferdy September 26, 2013 06:25

How to set Reynolds value in Ansys 14.0
 
Hello everybody!

I kindly ask you all if somebody knows if there is a way for setting a particular Reynolds value in Ansys 14.0 (noncommercial use), and if it was affermative, what steps I have exactly to follow to set it.

Thank you in andvance for helping me.

Ferdy

Lance September 26, 2013 08:28

CFX is a dimensional solver, so there is no way you can enter a Reynolds number directly. You can obtain a specific Re by setting boundary conditions and fluid properties, but since you havent described what you are trying to do we cant help you.

ferdy September 26, 2013 09:12

Thank you for the reply.

Actually the problem is that we are studying a flow of air in a channel at constant temperature, we have got this inlet conditions at the entry of the channel:
Re = 80.000
characteristic length (h) = 0,05 m
kinematic viscosity (v)=1,5*10^-5 m^2/s
inlet velocity (u)=24 m/s

The problem is that this value of the kinematic viscosity of the air at pressure of 1 bar should correspond at a temperature that lies between 16 and 17 C, but automatically Ansys has got only air at 25C in its library of fluids, or water, or ideal gas. I hope this is not a restriction because of the fact we are using a noncommercial version of Ansys (student version).
If there is a way of modifying the tempearture of the air from "default domain" -> basic settings -> "fluid and particle definition" we should be able to upload a new fluid (add new item) but we don't know how to do this.

Thank you very much.

Lance September 26, 2013 09:29

so.... your question boils down to how to create a new material?
See any of the tutorials on how to change/modify material properties. It is straightforward. I doubt that the student version has a restriction on creating new materials.

ferdy September 27, 2013 09:26

Thank you!we have been able to solve our library problem...thank you...


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