https://www.comsol.com/heat-transfer-module#what

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Yes, in COMSOL you can perform regular heat transfer simulation (Heat Transfer in Solids) and apply convection/radiation as boundary conditions. But you can also do Conjugate Heat Transfer simulation (multiphysics: Heat Transfer in Solids + Laminar/Turbulent Flow) to include air flow effects.

FEA way do you know how to put that temperature profile (ramp up holding ramp down) in comsol

When specifying temperature as boundary condition directly or defining external temperature for convection/radiation, you can enter a function instead of fixed value. It can be a name of a function created before in Definitions --> Functions (several types available) or expression written using Matlab syntax. Just be careful with units and with names of variables used by COMSOL. For example if you create a step function named step1, you should enter step1(t[1/s]) in the expression field where temperature is specified. COMSOL will warn you about unexpected units, unknown variables and incorrect syntax, if they occur in your expression.

Thank you so much . I began with a ramp function to get used to it better but I didn't know about the units it doesn't work , for example if I want to bake the piece with this ramp function until 120degC what should I put there in the expression

• https://files.engineering.com/getfile.aspx?folder=e19ad5b7-eaeb-4663-ad09-4

There's no need to define a variable. Just create a ramp function amd then enter rm1(t[1/s]) as temperature in boundary condition settings.

thanks. FEA way I need your help brother !
I need tut this model in comsol , but I didn't know what physics exactly should I use to resovle the problem I told you before. what is the different if I use "turbulent flow" or "heat transfer in fluid" and what are the boundary conditions that I should put to enter that temperature profile.

• https://files.engineering.com/getfile.aspx?folder=68076c08-b4bf-4ef9-aeb9-3

Seems to me you'd be better served posting your question in the COMSOL user's forum https://www.comsol.com/forumor or talk directly to a COMSOL applications engineer

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