Fixed bug in test27cells when running shadowfax hydro. Tried to fix 1D shadowswift, no success yet.

src/hydro/Shadowswift/hydro.h

@@ -182,12 +182,13 @@ __attribute__((always_inline)) INLINE static void hydro_end_density(
   if (hnew < p->h) {
     /* Iteration succesful: we accept, but manually set h to a smaller value
        for the next time step */
-    p->density.wcount = 1.0f;
+    const float hinvdim = pow_dimension(1.0f / p->h);
+    p->density.wcount = hinvdim;
     p->h = 1.1f * hnew;
   } else {
     /* Iteration not succesful: we force h to become 1.1*hnew */
     p->density.wcount = 0.0f;
-    p->density.wcount_dh = 1.0f / (1.1f * hnew - p->h);
+    p->density.wcount_dh = p->h / (1.1f * hnew - p->h);
     return;
   }
   volume = p->cell.volume;

src/hydro_properties.c

@@ -72,6 +72,7 @@ void hydro_props_init(struct hydro_props *p,
   /* change the meaning of target_neighbours and delta_neighbours */
   p->target_neighbours = 1.0f;
   p->delta_neighbours = 0.0f;
+  p->eta_neighbours = 1.0f;
 #endif
 
   /* Maximal smoothing length */

tests/test27cells.c

@@ -217,8 +217,20 @@ void clean_up(struct cell *ci) {
  * @brief Initializes all particles field to be ready for a density calculation
  */
 void zero_particle_fields(struct cell *c) {
+#ifdef SHADOWFAX_SPH
+  struct hydro_space hs;
+  hs.anchor[0] = 0.;
+  hs.anchor[1] = 0.;
+  hs.anchor[2] = 0.;
+  hs.side[0] = 1.;
+  hs.side[1] = 1.;
+  hs.side[2] = 1.;
+  struct hydro_space *hspointer = &hs;
+#else
+  struct hydro_space *hspointer = NULL;
+#endif
   for (int pid = 0; pid < c->count; pid++) {
-    hydro_init_part(&c->parts[pid], NULL);
+    hydro_init_part(&c->parts[pid], hspointer);
   }
 }