When coupling physics with vastly different numerical magnitudes, poor unit choices can trick the solver. For example, coupling a model (stresses in Pascals, 1e6 scale) with an electrostatics model (charge density in Coulombs, 1e-9 scale) without non-dimensionalization. The matrix then contains coefficients like 1e6 and 1e-9 , whose ratio is 1e15 . Always use a consistent, scaled unit system (e.g., mm, ms, kg, mA).
While stiffness ratios usually trigger this, mass ratios can too. If you have a simulation where parts are floating (unconstrained) or have "rigid body modes," the effective stiffness in certain directions is zero. coefficient ratio exceeds 1.0e8 - check results
: If your model converges and the results look physically realistic (e.g., no impossible displacements), this can sometimes be a benign warning in complex nonlinear models. Ansys Innovation Space Do you need help identifying which specific elements are triggering this warning in your solver output? Always use a consistent, scaled unit system (e
to look for unconstrained parts. You can often identify these by viewing the "Large Displacement" or "Total Deformation" results; parts that fly away are the culprits. Refine the Mesh : If your model converges and the results
The warning means that the solver has detected that the absolute value of the largest coefficient in matrix [A] is more than 100 million times larger than the absolute value of the smallest non-zero coefficient in the same matrix.
) in direct contact with soft elastomers or localized air gaps ( 3. Severe Element Distortion