Output the position of the cell in the output of the periodic boundary...

Output the position of the cell in the output of the periodic boundary condition test. Better tolerance requirements.

tests/testPeriodicBC.c

@@ -211,7 +211,7 @@ void end_calculation(struct cell *c) {
 /**
  * @brief Dump all the particles to a file
  */
-void dump_particle_fields(char *fileName, struct cell *main_cell) {
+void dump_particle_fields(char *fileName, struct cell *main_cell, int i, int j, int k) {
   FILE *file = fopen(fileName, "a");
 
   /* Write header */
@@ -221,7 +221,7 @@ void dump_particle_fields(char *fileName, struct cell *main_cell) {
           "ID", "pos_x", "pos_y", "pos_z", "v_x", "v_y", "v_z", "rho", "rho_dh",
           "wcount", "wcount_dh", "div_v", "curl_vx", "curl_vy", "curl_vz");
 
-  fprintf(file, "# Main cell --------------------------------------------\n");
+  fprintf(file, "# Centre cell at (i,j,k)=(%d, %d, %d) ---------------------\n", i,j,k);
 
   /* Write main cell */
   for (int pid = 0; pid < main_cell->count; pid++) {
@@ -331,7 +331,7 @@ void test_boundary_conditions(struct cell **cells, struct runner runner,
   end_calculation(main_cell);
 
   /* Dump particles from the main cell. */
-  dump_particle_fields(swiftOutputFileName, main_cell);
+  dump_particle_fields(swiftOutputFileName, main_cell, loc_i, loc_j, loc_k);
 
   /* Now perform a brute-force version for accuracy tests */
 
@@ -369,7 +369,7 @@ void test_boundary_conditions(struct cell **cells, struct runner runner,
   end_calculation(main_cell);
 
   /* Dump */
-  dump_particle_fields(bruteForceOutputFileName, main_cell);
+  dump_particle_fields(bruteForceOutputFileName, main_cell, loc_i, loc_j, loc_k);
 }
 
 /* And go... */

tests/tolerance_periodic_BC_normal.dat

 #   ID      pos_x      pos_y      pos_z        v_x        v_y        v_z           rho        rho_dh        wcount     wcount_dh         div_v       curl_vx       curl_vy       curl_vz
     0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   4e-6	      4e-5	    2e-4       3e-3		 2e-4	     1e-4	   1e-4		 1e-4
-    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   2e-6	      1.2e-4	    1e-4       1e-4		 3e-4	     5e-4	   5e-4	 	 5e-4
-    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-6	      1e-4	    1e-6       1e-4		 1e-4	     1e-4	   1e-4	 	 1e-4
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   2e-6	      2e-4	    1e-4       1e-4		 5e-4	     2e-3	   2e-3	 	 2e-3
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-6	      1e-4	    1e-6       1e-4		 5e-4	     2e-4	   2e-4	 	 2e-4

tests/tolerance_periodic_BC_perturbed.dat

 #   ID      pos_x      pos_y      pos_z        v_x        v_y        v_z           rho        rho_dh        wcount     wcount_dh         div_v       curl_vx       curl_vy       curl_vz
     0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   3e-6	      4e-5	    2e-4       3e-3		 2e-4	     1e-4	   1e-4		 1e-4
-    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   2e-6	      3e-3	    1e-4       1e-4		 2e-3	     6e-3	   6e-3	 	 6e-3
-    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-6	      1e-3	    1e-6       1e-4		 1e-4	     1e-4	   1e-4	 	 1e-4
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   2e-6	      6e-3	    1e-4       1e-4		 5e-3	     6e-3	   6e-3	 	 6e-3
+    0	    1e-6       1e-6	  1e-6 	       1e-6 	  1e-6	     1e-6	   1e-6	      2e-3	    1e-6       1e-4		 5e-4	     3e-3	   3e-3 	 3e-3