From a0931f6111c6df55db435c6e45348e75b66f0f5e Mon Sep 17 00:00:00 2001
From: Matthieu Schaller <matthieu.schaller@durham.ac.uk>
Date: Wed, 12 Apr 2017 09:46:48 +0100
Subject: [PATCH] Zero the multipoles when rebuilding if there are no gparts.
---
src/multipole.h | 5 +++++
src/space.c | 11 ++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/src/multipole.h b/src/multipole.h
index 0daef6de24..47f4764daf 100644
--- a/src/multipole.h
+++ b/src/multipole.h
@@ -354,6 +354,11 @@ INLINE static void gravity_field_tensors_print(const struct grav_tensor *l) {
#endif
}
+INLINE static void gravity_multipole_init(struct multipole *m) {
+
+ bzero(m, sizeof(struct multipole));
+}
+
/**
* @brief Prints the content of a #multipole to stdout.
*
diff --git a/src/space.c b/src/space.c
index 72ab8baa44..04bb3a513f 100644
--- a/src/space.c
+++ b/src/space.c
@@ -2150,7 +2150,16 @@ void space_split_recursive(struct space *s, struct cell *c,
ti_beg_max = get_integer_time_begin(e->ti_current + 1, time_bin_max);
/* Construct the multipole and the centre of mass*/
- if (s->gravity && gcount > 0) gravity_P2M(c->multipole, c->gparts, c->gcount);
+ if (s->gravity) {
+ if(gcount > 0)
+ gravity_P2M(c->multipole, c->gparts, c->gcount);
+ else {
+ gravity_multipole_init(&c->multipole->m_pole);
+ c->multipole->CoM[0] = c->loc[0] + c->width[0] / 2.;
+ c->multipole->CoM[1] = c->loc[1] + c->width[1] / 2.;
+ c->multipole->CoM[2] = c->loc[2] + c->width[2] / 2.;
+ }
+ }
}
/* Set the values for this cell. */
--
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