small CG solver work

src/main/c/includes/fluid/sim/grid2/solver_consts.h

@@ -5,17 +5,17 @@
 /**
  * The number of times to relax most solvers
  */
-#define FLUID_GRID2_LINEARSOLVERTIMES 10
+#define FLUID_GRID2_LINEARSOLVERTIMES 5
 
 /**
  * The number of times to relax most solvers
  */
-#define FLUID_GRID2_SOLVER_MULTIGRID_MAX_ITERATIONS 5
+#define FLUID_GRID2_SOLVER_MULTIGRID_MAX_ITERATIONS 10
 
 /**
  * Tolerance to target for multigrid precomputing in projection
  */
-#define FLUID_GRID2_SOLVER_MULTIGRID_TOLERANCE 1.0f
+#define FLUID_GRID2_SOLVER_MULTIGRID_TOLERANCE 0.1f
 
 /**
  * The number of times to relax most solvers
@@ -25,7 +25,7 @@
 /**
  * Tolerance to target for conjugate gradient precomputing in projection
  */
-#define FLUID_GRID2_SOLVER_CG_TOLERANCE 0.1f
+#define FLUID_GRID2_SOLVER_CG_TOLERANCE 0.01f
 
 /**
  * Width of a single grid cell

src/main/c/src/fluid/sim/grid2/velocity.c

@@ -205,7 +205,7 @@ LIBRARY_API void fluid_grid2_solveProjection(
         chunk->projectionIterations++;
     }
     if(chunk->projectionResidual > FLUID_GRID2_SOLVER_CG_TOLERANCE || chunk->projectionResidual < -FLUID_GRID2_SOLVER_CG_TOLERANCE){
-        // printf("Projection residual didn't converge!   %f  \n",chunk->projectionResidual);
+        printf("Projection residual didn't converge!   %f  \n",chunk->projectionResidual);
     }
 
     //finest grain iteration with conjugate gradient method

src/main/c/src/math/ode/conjugate_gradient.c

@@ -115,6 +115,7 @@ int solver_conjugate_gradient_init(float * phi, float * phi0, float a, float c){
  * @param phi0 The phi array from the last frame
  * @param a The a const
  * @param c The c const
+ * @return The residual
  */
 float solver_conjugate_gradient_iterate_parallel(float * phi, float * phi0, float a, float c){
     int i, j, k;