Hi all, I am trying to make a transient thermoelastic RB model. Both Internal heat flux and external heat exchange described by Newton's law of cooling(Robin boundary condition) are considered. It works well when the three thermal conditions (heat flux, heat transfer coefficient and ambient temperature) are chosen as parameters. However, abnormal results are observed when the material properties (Young's modulus, Poisson's ratio, thermal expansion coefficient and heat conductivity) are added as parameters: Three displacement components remain 0 and the temperature increases drastically as the time goes by. What's more, I notice that the difference between the first and the second POD eigenvalues is extremely large:
POD Eigenvalues: eigenvalue 0 = 4.4536e+08 eigenvalue 1 = 2.45303e-07 ... last eigenvalue = -1.90536e-07 The matrix assembly should not pose problem because it runs well in steady case and I simply copy the assembly functions without any modification. Thus I am really confused and I cannot figure out where the problem is. Could you give me some suggestions? Thanks a lot. Gauvain -- ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
