Dear all 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" : 1) In order to understand correct behavior, I want to try test simulation using poisson.par, which is one of the example parameter file.
But, it does not work. The output told me the grid structure is inconsistent, and I also try another example, but it also has same error. Are there other available par file for CT_MutiLevel ?
2) To solve the elliptic equation with 1/r boundary condition, is CT_MutiLevel the best way ? If there are another thorn to solve elliptic equation in EinsteinToolkit, please tell me. Since I want to use Carpet, the thorn should be compatible with Carpet.
3) After solving elliptic equation, I want to solve time evolution. Since CT_MutiLevel is a solver using MultiGrid method, we must prepare several Carpet grids on whole domain. But, is it consist with time evolution ? If there is an example par file, let me know.
Best regard. Taishi.
************************************ Taishi Ikeda Physics Department Sapienza University of Rome (Italy) taishi.ikeda@uniroma1.it ************************************