Learning Forum

[sarathaj]

I am working a thermal Analysis of a Motor using MRF rotating at 5000 RPM And I have modelled Air domain ( Sphere) to monitor the fluid flow. It is a natural convection. I applied heat loss to the componenets in the Motor. Bu when I apply pressure outlet at the surface of the Sphere ( air domain- fluid) lot of heat emitted to the atmosphere resulting in the lesser tempearture on the components.
Should I apply fixed Wall tempearture ( ambient temperature) or HTC & temperature to the sphere boundary ?  

[Essence]

Hello,

Can you share a screenshot of the domain for better understanding?

[sarathaj]

 

 

I am Sorry , I cannot share the screenshot because of confidentality. 
I am provide bit more clarity 
A large sphere shaped air domian acting as a fluid ( to monitor velocity when motor rotates), |A geometry contain both motor and stator, and applied MRF to the rotar region and the heat loss to few components ( both rotor and stator).
I ran steady state first ( only flow and turbulent on, energy off) to get flow field converged, then turned on energy equation ON during transient analysis ( flow and turbulent off) and applied heat loss to the geometry. 
here I applied the outer surface boundary of the sphere as pressure Outlet. 
Note- It is a Natural Convection. 

 

 

[Essence]

Please run the flow and turbulence equations with energy equation since the heat supplied or extracted impacts the flow and turbulence.

[sarathaj]

You mean during the transient analysis ( to turn on all energy, flow and turbulent equaiton) ?

[Essence]

Yes.

[sarathaj]

Thank you, I will try and let you know 

[Essence]

Sure, please.

[sarathaj]

HI 
I ran with all three equaitons, It gives the same result ( No changes ) 

[Essence]

I see. You can always try to open a new Support case in Ansys customer support portal. This will help us to suggest you the points more effectively.

[sarathaj]

Sure, Thank you