Thanks a lot for your answer,nYes I should simulate this flow upon my structure and after simulating heating, connect my result to static or dynamic analysis and investigate the effect of heating on my structure. but i do not know from which part of ansys i can do this.nand another question i have: in my model heating rate and gas flow is dependent to time. how can i define this?nis it easy to define these rates? i just need some information to start. i don't know how can start, just need some guidance.nnthanks a million if help me to understand.n