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Problem: I have a Solid(Brick,Retangle)and want to simulate a "inner heat transfer" (conductional) with different located starting temperatures over time...let´s say we have a linear increase of temp in x-direction, rightside (x=0mm,T=273K)and leftside (x=100mm,T=373K)

I read that the domain must be patched,ok. My question is,...is it possible to input the linear temp function by custom field function or is there a cell-based-udf needed, and then ,if someone can show me that udf source

I would be happy about any help

cheers Optixxx

If I read this right, you are looking to initialize a transient problem. If you have a linear gradient through an isotropic material, just set your boundaries to fixed temps and do an initial steady-state run.

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No,that is not what i mean...i want to simulate inner temperature balancing of different starting temp regions in a solid. Let´s say you have a Hamburger which is hot on the left side and still frozen on the right side and you stop the outer energy.Which temp distribution occurs over what time.A linear temp decrease is just an example,maybe i want also to input another function ...basically is should be T(K)=f(x)

Hope this was lille clearer...question is,is a udf needed or just works with a custon-field-function.Problem T is K and x is mm or m.

Optixxx

I'm pretty sure you will need a UDF.