From 7dfcc480ba1e19bd3232349fc733caef94034292 Mon Sep 17 00:00:00 2001
From: stainer_t <thomas.stainer@oecd-nea.org>
Date: Mon, 8 Sep 2025 13:48:49 +0200
Subject: Initial commit from Polytechnique Montreal

---
 Donjon/src/NAPFTD.f | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Donjon/src/NAPFTD.f

(limited to 'Donjon/src/NAPFTD.f')

diff --git a/Donjon/src/NAPFTD.f b/Donjon/src/NAPFTD.f
new file mode 100644
index 0000000..a1058a7
--- /dev/null
+++ b/Donjon/src/NAPFTD.f
@@ -0,0 +1,58 @@
+*DECK NAPFTD
+      SUBROUTINE NAPFTD(NXP,MXP,NXD,MXD,FXTD)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Perform a projection of second geometry on first one to compute 
+*     fraction of region of the first geometry occupied by the second 
+*     geometry regions
+*
+*Copyright:
+* Copyright (C) 2014 Ecole Polytechnique de Montreal.
+*
+*Author(s): 
+* R. Chambon
+*
+*Parameters: input/output
+*    for core with heterogeneous mixture
+* NXP    number of region along X direction for first geometry
+* MXP    mesh of region along X direction for first geometry
+* NXD    number of region along X direction for second geometry
+* MXD    mesh of region along X direction for second geometry
+* FXTD   fraction of region along X direction
+*
+*-----------------------------------------------------------------------
+*
+      USE GANLIB
+      IMPLICIT NONE
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER      NXP,NXD
+      REAL         MXP(NXP),MXD(NXD),FXTD(NXP,NXD)
+*----
+*  LOCAL VARIABLES
+*----
+      INTEGER IP,ID
+      REAL DXP
+
+      DO IP=1,NXP
+      DXP=MXP(IP+1)-MXP(IP)
+      DO ID=1,NXD
+        IF((MXD(ID).LE.MXP(IP)).AND.(MXD(ID+1).GE.MXP(IP+1))) THEN
+          FXTD(IP,ID)=1.0
+        ELSEIF ((MXD(ID).LE.MXP(IP)).AND.(MXD(ID+1).GT.MXP(IP))) THEN
+          FXTD(IP,ID)=(MXD(ID+1)-MXP(IP))/DXP
+        ELSEIF ((MXD(ID).GE.MXP(IP)).AND.
+     1          (MXD(ID+1).LE.MXP(IP+1))) THEN
+          FXTD(IP,ID)=(MXD(ID+1)-MXD(ID))/DXP
+        ELSEIF ((MXD(ID).LT.MXP(IP+1)).AND.
+     1          (MXD(ID+1).GE.MXP(IP+1))) THEN
+          FXTD(IP,ID)=(MXP(IP+1)-MXD(ID))/DXP
+        ENDIF
+      ENDDO
+      ENDDO
+
+      RETURN
+      END
-- 
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