Static versus total temperature impacts on thermal stress in solids
Hello!
Background: I am currently running a simulation that exports a temperature profile from Fluent to transient structural because I want to analyze how the temperature in the fluid causes thermal stress in the solid.
Do I want to use the static temperature result from Fluent, or should I use the total temperature results?
What temperature does the solid really 'see' when thermal stress is created?
Thank you!
Best Answer

subhamdas Member
The total temperature is the temperature of the fluid when it is brought to rest adiabatically. Hence, it is the sum of static and dynamic temperature((v^2)/(2*Cp)). Therefore, the actual temperature of the fluid is the static temperature which should be used in your case.
Also check the values of the static and total temperature at the wall. Since at the wall the noslip boundary conditions yields zero fluid velocity, hence static temperature should be equal to the total temperature. Therefore, if you are interested in the temperature values at the solid wall alone, both of them would work.
Answers
The total temperature is the temperature of the fluid when it is brought to rest adiabatically. Hence, it is the sum of static and dynamic temperature((v^2)/(2*Cp)). Therefore, the actual temperature of the fluid is the static temperature which should be used in your case.
Also check the values of the static and total temperature at the wall. Since at the wall the noslip boundary conditions yields zero fluid velocity, hence static temperature should be equal to the total temperature. Therefore, if you are interested in the temperature values at the solid wall alone, both of them would work.