Hi,
I want to use COMSOL to model resistivity (geophysics). (Electrical Resistivity Tomography, ERT)
I have a number of cells (side by side, creating a square of cells in both x and y direction), which each cell has a specific conductivity value.
On surface I assume a number of electrodes (E1,E2,....E10). In each electrode, I inject current ( Physics-->Point Settings-->Qj0=1) and I want to calculate the potential on the other electrodes.
My boundaries conditions are
1) On surface (between ground and air) homogeneous neumann condition (electrical insulation ?)
2) On the far left, right and bottom edges homogeneous Dirichlet boundaries V=0) ( ground?)
3) Continuity on the the other boundaries)
If I use the same conductivity value in each cell, the potential should be given by this equation
V=I/(2*pi*conductivity)*r
r-->distance from source.
But comsol's solution is not what it should be.
What am I doing wrong?
I want to use COMSOL to model resistivity (geophysics). (Electrical Resistivity Tomography, ERT)
I have a number of cells (side by side, creating a square of cells in both x and y direction), which each cell has a specific conductivity value.
On surface I assume a number of electrodes (E1,E2,....E10). In each electrode, I inject current ( Physics-->Point Settings-->Qj0=1) and I want to calculate the potential on the other electrodes.
My boundaries conditions are
1) On surface (between ground and air) homogeneous neumann condition (electrical insulation ?)
2) On the far left, right and bottom edges homogeneous Dirichlet boundaries V=0) ( ground?)
3) Continuity on the the other boundaries)
If I use the same conductivity value in each cell, the potential should be given by this equation
V=I/(2*pi*conductivity)*r
r-->distance from source.
But comsol's solution is not what it should be.
What am I doing wrong?