Hello, I’m a user of EinsteinToolkit.

Now, I’m trying to solve Poisson's equation using ctthorn as initial data before time evolution on EinsteinToolkit.

The boundary condition is 1/r.

I already implemented my thorns for the source term of the equation,

and solved the equation using "CT_MutiLevel”.

I checked if the final solution is good solution of the original equation, but

it is not good solution.

I changed the resolution, but it is not improved.

So, I may misunderstand how to use CT_MutiLevel thorns, and I have questions relate to "CT_MutiLevel" :

In order to understand correct behavior,

I want to try test simulation using poisson.par, which is one of the example parameter file.