Meshing
The mesh is an important component of any numerical model of an electric discharge model. When assessing a numerical solution it is always important to ensure that the results do not change significantly when the mesh is refined; this is sometimes referred to as mesh independence. The Electric Discharge Module includes default mesh suggestions that automatically refine the mesh based on the physics features selected. In most cases manually tuning the default mesh improves performance and helps with the solution process.
Modeling different types of electric discharges typically requires varied strategies. Generally, regions like the streamer channel and corona discharge layer necessitate a finer mesh. Since electric discharge models solve transport equations, mapped and boundary layer meshes are often employed. It's also beneficial to use a coarser mesh in areas where discharges are weak to reduce the degrees of freedom (DoFs).
For more details on setting up a meshing sequence, see the Meshing chapter in the COMSOL Multiphysics Reference Manual.
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Positive Streamer Propagation in Transformer Oil: Application Library path Electric_Discharge_Module/Liquid_Dielectrics/streamer_in_transformer_oil
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Negative Surface Discharge at Gas–Solid Interface: Application Library path Electric_Discharge_Module/Dielectric_Barrier_Discharges/negative_surface_discharge