ell_relax: make the time stepping factor configurable

And use different defaults for different FD stencils.

1 files changed, 5 insertions, 0 deletions

diff --git a/ell_relax.h b/ell_relax.h
index 0e32015..4e97882 100644
--- a/ell_relax.h
+++ b/ell_relax.h
@@ -179,6 +179,11 @@ typedef struct EllRelaxContext {
     EllRelaxBoundary boundaries[4];
 
     /**
+     * The time stepping factor in relaxation.
+     */
+    double relax_factor;
+
+    /**
      * Values of the unknown function.
      *
      * Allocated by the solver in mg2di_ell_relax_alloc(), owned by the solver.