From 727ec909112d4bd5d6c02a492385496667ce41f5 Mon Sep 17 00:00:00 2001
From: Luke Shingles <luke.shingles@gmail.com>
Date: Sat, 8 Mar 2025 16:54:00 +0000
Subject: [PATCH] Fix pos_component_vel_relative_to_flow

---
 grid.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grid.cc b/grid.cc
index 44ae9c452..c84b7e606 100644
--- a/grid.cc
+++ b/grid.cc
@@ -2451,12 +2451,12 @@ auto get_totmassradionuclide(const int z, const int a) -> double {
           // packet pos below min
           const double boundaryposmin = grid::get_cellcoordmin(cellindex, d) / globals::tmin * tstart;
           delta = pktposgridcoord[d] - boundaryposmin;
-          isoutside_thisside = pos_component_vel_relative_to_flow && (pktposgridcoord[d] < (boundaryposmin - 10.));
+          isoutside_thisside = !pos_component_vel_relative_to_flow && (pktposgridcoord[d] < (boundaryposmin - 10.));
         } else {
           // packet pos above max
           const double boundaryposmax = cellcoordmax[d] / globals::tmin * tstart;
           delta = pktposgridcoord[d] - boundaryposmax;
-          isoutside_thisside = !pos_component_vel_relative_to_flow && (pktposgridcoord[d] > (boundaryposmax + 10.));
+          isoutside_thisside = pos_component_vel_relative_to_flow && (pktposgridcoord[d] > (boundaryposmax + 10.));
         }
 
         if (isoutside_thisside) {