Merge branch 'update_acceleration_in_kick1' into 'master'

Kick1 update

See merge request !472

src/runner.c

@@ -1001,6 +1001,21 @@ void runner_do_kick1(struct runner *r, struct cell *c, int timer) {
 
         /* do the kick */
         kick_part(p, xp, ti_begin, ti_begin + ti_step / 2, timeBase);
+
+        /* Update the accelerations to be used in the drift for hydro */
+        if (p->gpart != NULL) {
+
+          const float a_tot[3] = {p->a_hydro[0] + p->gpart->a_grav[0],
+                                  p->a_hydro[1] + p->gpart->a_grav[1],
+                                  p->a_hydro[2] + p->gpart->a_grav[2]};
+
+          p->a_hydro[0] = a_tot[0];
+          p->a_hydro[1] = a_tot[1];
+          p->a_hydro[2] = a_tot[2];
+          p->gpart->a_grav[0] = a_tot[0];
+          p->gpart->a_grav[1] = a_tot[1];
+          p->gpart->a_grav[2] = a_tot[2];
+        }
       }
     }