Hi,
I am using COMSOL 4.0 RF to model light scattering. In 2D model, i calculate a very thin sheet scattering, which is 1D geometry in such 2D model. So i use the surface current boundary condition for this 1D line, and at the same time, i use a weak form boundary PDE to calculate the current distribution. Generally, It is a coupling problem between 2D RF and 1D PDE. However, when i define a derivative at the weak boundary PDE, i.e., ux, i got the following error
Failed to evaluate variable Jacobian.
- Variable: ux
- Geometry: 1
- Boundary: 18
I have tested that, if i define the weak PDE (also 2D), there is no problem, and the weak expression can be performed. So i think the key problem is that the derivative along this 1D line. Any suggestion will be greatly appreciated.
Best
Bruno
I am using COMSOL 4.0 RF to model light scattering. In 2D model, i calculate a very thin sheet scattering, which is 1D geometry in such 2D model. So i use the surface current boundary condition for this 1D line, and at the same time, i use a weak form boundary PDE to calculate the current distribution. Generally, It is a coupling problem between 2D RF and 1D PDE. However, when i define a derivative at the weak boundary PDE, i.e., ux, i got the following error
Failed to evaluate variable Jacobian.
- Variable: ux
- Geometry: 1
- Boundary: 18
I have tested that, if i define the weak PDE (also 2D), there is no problem, and the weak expression can be performed. So i think the key problem is that the derivative along this 1D line. Any suggestion will be greatly appreciated.
Best
Bruno
