2 | IMPLEMENTING A POINT SOURCE
Introduction
Consider Poisson’s equation on the unit circle with a point source at the origin. Its formal
expression is:
where δ is the Dirac δ distribution located at the origin. The exact solution to this
boundary value problem is −(1/2π)log(r), which has a singularity at the origin. You can
model the point source by adding a Point Source node to your COMSOL Multiphysics
model.
Application Library path: COMSOL_Multiphysics/Equation_Based/point_source
Modeling Instructions
From the File menu, choose New.
NEW
In the New window, click Model Wizard.
MODEL WIZARD
1 In the Model Wizard window, click 2D.
2 In the Select Physics tree, select Mathematics>Classical PDEs>Laplace Equation (lpeq).
3 Click Add.
4 Click Study.
5 In the Select Study tree, select General Studies>Stationary.
6 Click Done.
GEOMETRY
Circle 1 (c1)
In the Geometry toolbar, click Circle.
Point 1 (pt1)
1 In the Geometry toolbar, click Point.
仿真文件下载https://download.csdn.net/download/yjw0911/85473994