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  1. Hi everyone, I am trying to perform thermal simulation with heat source and sink as boundary condition. I have a positive heat flux(as QVOL acting on solid elements) and a negative heat flux (as QBDY1 acting on conduction interface). However most of the time I could see that the simulation does not converge and the Temperature results are very big. Attached here I have 2 fem files with exactly the same geometry and boundary condition and element size, but different meshing directions. the 1.fem file yields correct results while 2.fem doesn not converge. I have tried to experiment with changing element normal and changing material direction all to be along heat transfer direction but still 2.fem file does not converge and I cant find what makes the difference in simulation results. can anybody check to see if you can converge the 2.fem file ? and what makes 2.fem file not converge? thanks and looking forward to hear from you Rafezi 1.fem 2.fem
  2. I found out Rahul, the simulation is correct, I have a mistake in calculation. I shoud have used 35 as thikness instead of 0.35
  3. Hi Rahul, yes sure model.fem
  4. Hi every one, I am trying to simulate a convection and conduction model and compare it with analytic results. I have a cube with K value of 100 as it can be seen in the attachment, with upper surface temperature of 40. The lower surface is exposed to free convection with amb. temp of 20 and H value of 40. The thinkness if cube is 0.35m. Analytical calculation of problem would yield lower surface temp. of 37.3 while simulation results always gets very close to ambient temperature. can anyone explain why there is a difference ? T1 = 40 K = 100 H = 40 Tamb = 20 L = 0.35 T2 = ? k.(T1-T2)/L = H(T2 - Tamb) T2 = 37.3