From 9ad840d0c42dcf395812172e3708bc43bd2f2c56 Mon Sep 17 00:00:00 2001
From: Andreas Holm <60451789+holm10@users.noreply.github.com>
Date: Wed, 6 Nov 2024 19:54:36 -0800
Subject: [PATCH] Reformulate drift heating terms to us '**2'

---
 bbb/oderhs.m | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/bbb/oderhs.m b/bbb/oderhs.m
index bf32b3c9..1a5eaa34 100755
--- a/bbb/oderhs.m
+++ b/bbb/oderhs.m
@@ -4601,23 +4601,21 @@ ccc             call volave(nx, ny, j2, j5, i2, i5, ixp1(0,0), ixm1(0,0),
 c to the friction force between neutrals and ions
                up1cc = 0.5*(up(ix,iy,1)+up(ix1,iy,1))
                upgcc = 0.5*(up(ix,iy,iigsp)+up(ix1,iy,iigsp))
-               vycc = cfnidhgy*0.25*(vy(ix,iy,iigsp)+vy(ix1,iy,iigsp))
-     .                              *(vy(ix,iy,iigsp)+vy(ix1,iy,iigsp))
-               temp4 = cfnidhg2*0.25*(v2(ix,iy,iigsp)+v2(ix1,iy,iigsp))
-     .                              *(v2(ix,iy,iigsp)+v2(ix1,iy,iigsp))
+               vycc = (cfnidhgy**0.5)*0.5*(vy(ix,iy,iigsp)+vy(ix1,iy,iigsp))
+               v2cc = (cfnidhg2**0.5)*0.5*(v2(ix,iy,iigsp)+v2(ix1,iy,iigsp))
 
 c              Ion rate from CX
                psicx(ix,iy) = cfticx*nucx(ix,iy,1)*ng(ix,iy,1)*vol(ix,iy)
 
 c              Ion energy source/sink from ioniz & recom
                seik(ix,iy) = cfneut * cfneutsor_ei * cfnidh * 
-     .              0.5*mi(1) * ( (up1cc-upgcc)**2 + vycc + temp4 ) * 
+     .              0.5*mi(1) * ( (up1cc-upgcc)**2 + vycc**2 + v2cc**2) * 
      .              (  psor(ix,iy,1) + cftiexclg*psorrg(ix,iy,1)
      .              + (1 + cftiexclg) * psicx(ix,iy) )
 
 c              Ion energy source from mol. diss
                seid(ix,iy) = cftiexclg * cfneut * cfneutsor_ei * cnsor
-     .              * (eion*ev + cfnidhdis*0.5*mg(1)*(upgcc**2 + vycc + temp4) )
+     .              * (eion*ev + cfnidhdis*0.5*mg(1)*(upgcc**2 + vycc**2 + v2cc**2) )
      .              * psordis(ix,iy) 
 
 c              Ion energy source from drift heating 
@@ -4639,18 +4637,18 @@ ccc             call volave(nx, ny, j2, j5, i2, i5, ixp1(0,0), ixm1(0,0),
      .              + (1.0-cftiexclg)*seit(ix,iy)
 
 c              Atom kinetic energy source from recom & CX
-               seak(ix,iy) = 0.5*mg(1) * ( (up1cc-upgcc)**2 + vycc + temp4 )
+               seak(ix,iy) = 0.5*mg(1) * ( (up1cc-upgcc)**2 + vycc**2 + v2cc**2 )
      .              * (psorrg(ix,iy,1)+psicx(ix,iy))
 
 c              Atom kinetic energy source from diss
                sead(ix,iy) = ( eion*ev + cfnidh*cfnidhdis*0.5*mg(1)*
-     .              (upgcc*2 + vycc + temp4) )*psordis(ix,iy)
+     .              (upgcc*2 + vycc**2 + v2cc**2) )*psordis(ix,iy)
 
 
 c              Atom energy source from drift heating 
                seadh(ix,iy) = cfnidh2* ( -mg(1) *up1cc*upgcc 
      .              * (psorrg(ix,iy,1)+psicx(ix,iy)) 
-     .              + 0.5*mg(1) * (upgcc**2 + vycc + temp4)
+     .              + 0.5*mg(1) * (upgcc**2 + vycc**2 + v2cc**2)
      .              * (psor(ix,iy,1)+psorrg(ix,iy,1)+2*psicx(ix,iy)) )
 
                reseg(ix,iy,1) = reseg(ix,iy,1)