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Analytic function - Failed to find consistent initial values
Posted Mar 31, 2011, 5:17 a.m. EDT Heat Transfer & Phase Change, Studies & Solvers, Structural Mechanics Version 4.1 0 Replies
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I'm running this coupled heat transfer-structural model where the Young modulus (E) is a function of temperature (T), so it's a one way coupling. The analysis is time dependent. I define the relation between E and T using an analytic function (so called myYM) in "Materials" as a simple power law:
24.2+5.6*T^1.45
I define two time-dependent steps in my "Study", first one only solving for heat transfer physics and the next one for the solid mechanics physics. I tried both Segragated and Fully coupled solvers (with direct and iterative options), but each time I get the following error:
- Failed to find consistent initial values
Error in user-defined function.
Function: mod1.mat1.def.myYM
Strangely enough, when I change the analytic function to a linear equation, i.e. 24.2+5.6*T, the problem is solved! So I guess there is a problem with derivative of analytic function. I also tried to give the derivative manually, but it didn't work either.
Does anyone know how to work around this problem?
Hello Ali Reza
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