It can be shown that if the cell Péclet number has a value larger than one Pec > 1 the solution will oscillate. In the linearized Navier-Stokes interface the variables lnsf.CellPe_th and lnsf.CellPe_v can be plotted to assess the characteristic number when comparing convection to viscous and thermal diffusion, respectively.
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The equation residuals can be visualized in the LE and the LNS interfaces by plotting, for example, lnsf.res_e (equation residual for the energy equation), lnsf.res_mx (equation residual for the momentum equation x-component), lnsf.res_my, lnsf.res_mz, and lnsf.res_e (equation residual for the energy equation).
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See for example the model Point Source in 2D Jet: Radiation and refraction of sound waves through a 2D shear layer found in the Model Gallery:
www.comsol.com/model/point-source-in-2d-jet-radiation-and-refraction-of-sound-waves-through-a-2d-shea-16685 |