Hello Barry,

Thank you a lot for your help, Now I am getting the attached error message.

Bests,
Sawsan
From: Barry Smith <bsmith@petsc.dev>
Sent: Wednesday, December 20, 2023 6:32 PM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi@wsu.edu>
Cc: Mark Adams <mfadams@lbl.gov>; petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
 

[EXTERNAL EMAIL]


Instead of 

    call PCCreate(PETSC_COMM_WORLD, pc, ierr)
    call PCSetType(pc, PCILU,ierr) ! Choose a preconditioner type (ILU)
    call KSPSetPC(ksp, pc,ierr)  ! Associate the preconditioner with the KSP solver

do

    call KSPGetPC(ksp,pc,ierr)
    call PCSetType(pc, PCILU,ierr)

Do not call KSPSetUp(). It will be taken care of automatically during the solve



On Dec 20, 2023, at 8:52 PM, Shatanawi, Sawsan Muhammad via petsc-users <petsc-users@mcs.anl.gov> wrote:

Hello, 
I don't think that I set preallocation values when I created the matrix, would you please have look at my code. It is just the petsc related part from my code.
I was able to fix some of the error messages. Now I have a new set of error messages related to the KSP solver (attached)

I appreciate your help​

Sawsan
From: Mark Adams <mfadams@lbl.gov>
Sent: Wednesday, December 20, 2023 6:44 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi@wsu.edu>
Cc: petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
 
[EXTERNAL EMAIL]
Did you set preallocation values when you created the matrix?
Don't do that.

On Wed, Dec 20, 2023 at 9:36 AM Shatanawi, Sawsan Muhammad <sawsan.shatanawi@wsu.edu> wrote:
Hello, 

I am trying to create a sparse matrix( which is as I believe a zero matrix) then adding some nonzero elements to it over a loop, then assembling it 

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From: Mark Adams <mfadams@lbl.gov>
Sent: Wednesday, December 20, 2023 2:48 AM
To: Shatanawi, Sawsan Muhammad <sawsan.shatanawi@wsu.edu>
Cc: petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov>
Subject: Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
 
[EXTERNAL EMAIL]
I am guessing that you are creating a matrix, adding to it, finalizing it ("assembly"), and then adding to it again, which is fine, but you are adding new non-zeros to the sparsity pattern.
If this is what you want then you can tell the matrix to let you do that.
Otherwise you have a bug.

Mark

On Tue, Dec 19, 2023 at 9:50 PM Shatanawi, Sawsan Muhammad via petsc-users <petsc-users@mcs.anl.gov> wrote:
Hello everyone,

I hope this email finds you well.

 My Name is Sawsan Shatanawi, and I am currently working on developing a Fortran code for simulating groundwater flow in a 3D system. The code involves solving a nonlinear system, and I have created the matrix to be solved using the PCG solver and Picard iteration. However, when I tried to assign it as a PETSc matrix I started getting a lot of error messages.

I am kindly asking if someone can help me, I would be happy to share my code with him/her.

Please find the attached file contains a list of errors I have gotten

Thank you in advance for your time and assistance.

Best regards,

 Sawsan


<Matrix_RHS.F90><out.txt><solver.F90>