Hi,

I hope that somebody will help me with my problem. I will try to explain as best as I can including pictures of attempt and description of the problem.

I'm trying to simulate brake cooling by using forced convection. The problem is that with my conditions it doesn't show the cooling process. A temperature of 800K stays the same no matter what I try. Air temperature stays the same as well. I know heat transfer coeficient of air passing by, but I don't know where to apply it, as it only lets me to apply for solids (whole part). I know the maximum temperature that brake disc is going to reach.

A complete desing looks like that

My attempt to solution (I'm using only the brake disc to find a method as this saves my time) and results needed:

Forced convection (cooling) in solids simulation problem:

• Wall temperature (800K) and fluid temperature (293K) stays the same, even if cold (293K) air flow is passing through.

Results needed and conditions:

• Temperature change in fluid, depending on solid temperature.
• Temperature change in solid due to cooling effect of air.
• No fans.
• Solid (brake disc) is rotating.

Steps taken, setting up in wizard:

Heat conduction in solids                                                                                                                                                    

  Fluid - Air

Solid material – gray cast iron.                                                                                

Initial solid temperature – 800K, Velocity in X direction 30m/s. Temperature 293.2K.

Further conditions: 

Boundary Condition – Real Wall temperature 800K.

Solid material – Grey cast iron.

Flow simulation type: External

THANK YOU all in advance.