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Grounding / Earthing system
Posted 24.08.2025, 15:06 GMT-4 Geometry, Modeling Workflow Version 5.5 1 Reply
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Hello everyone.
I want to simulate a grounding/earthing system. I started with a simple grid. As usual to grounding/earthing simulation softwares I applied a current to a line segment. The problem is that the current doesn't flow from one segment to another. All line segments are apparently isolated. Line segments were imported from autocad, but also tried to draw the lines in COMSOL or to draw a square polygon. The result was the same. I tried "union" geometry and "convert to curve". Nothing works. I appreciate suggestions to work around this problem.
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Bear in mind that Comsol Multiphysics is primarily (but not exclusively) a finite-element modeling code, and primarily (but not exclusively) intended to model our 3D world (although it supports 2D and 1D representations). Finally, it primarily (but not exclusively) solves problems that are expressed in the form of partial differential equations, subject to various volume, boundary, and initial conditions, etc. A wire with a zero radius (i.e., a "line segment") is, if standing alone, literally unphysical in a 3D universe, although a thin wire could/can potentially be represented satisfactorily, for some purposes, as a 1D boundary condition on a line or curve, within a 2D or 3D domain. How are you representing it? Are you looking at purely circuit-like (e.g., DC or 60 Hz) behavior or are you interested in RF/microwave behavior? Do you wish to allow currents to flow along your wire and into/out of the Earth? How exactly are you attempting to "apply" the current in question? In addition to thinking about and answering these questions, I suggest you post your .mph file to the forum and explain more about the physics problem you are trying to solve.
-------------------Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
