From eb5b891a1156107299b3d47c4b28c7d79253cd17 Mon Sep 17 00:00:00 2001
From: Weiqun Zhang <WeiqunZhang@lbl.gov>
Date: Sun, 18 Aug 2024 20:38:26 -0500
Subject: [PATCH] Add runtime parameter use_gauss_seidel to MAC and nodal
 projectors (#143)

The default is true for both.
---
 Projections/hydro_MacProjector.cpp   | 17 ++++++++++++++++-
 Projections/hydro_NodalProjector.cpp |  7 ++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Projections/hydro_MacProjector.cpp b/Projections/hydro_MacProjector.cpp
index c60e0a130..d7da86c69 100644
--- a/Projections/hydro_MacProjector.cpp
+++ b/Projections/hydro_MacProjector.cpp
@@ -101,8 +101,9 @@ void MacProjector::initProjector (
         m_eb_abeclap = std::make_unique<MLEBABecLap>(m_geom, ba, dm, a_lpinfo, m_eb_factory);
         m_linop = m_eb_abeclap.get();
 
-        if (m_phi_loc == MLMG::Location::CellCentroid)
+        if (m_phi_loc == MLMG::Location::CellCentroid) {
             m_eb_abeclap->setPhiOnCentroid();
+        }
 
         m_eb_abeclap->setScalars(0.0, 1.0);
         for (int ilev = 0; ilev < nlevs; ++ilev) {
@@ -131,6 +132,13 @@ void MacProjector::initProjector (
             m_abeclap = std::make_unique<MLABecLaplacian>(m_geom, ba, dm, a_overset_mask, a_lpinfo);
         }
 
+        bool use_gauss_seidel = true;
+        {
+            ParmParse pp("mac_proj");
+            pp.query("use_gauss_seidel", use_gauss_seidel);
+        }
+        m_abeclap->setGaussSeidel(use_gauss_seidel);
+
         m_linop = m_abeclap.get();
 
         m_abeclap->setScalars(0.0, 1.0);
@@ -582,6 +590,13 @@ void MacProjector::initProjector (Vector<BoxArray> const& a_grids,
         m_poisson = std::make_unique<MLPoisson>(m_geom, ba, dm, a_overset_mask, a_lpinfo);
     }
 
+    bool use_gauss_seidel = true;
+    {
+        ParmParse pp("mac_proj");
+        pp.query("use_gauss_seidel", use_gauss_seidel);
+    }
+    m_poisson->setGaussSeidel(use_gauss_seidel);
+
     m_linop = m_poisson.get();
 
     m_mlmg = std::make_unique<MLMG>(*m_linop);
diff --git a/Projections/hydro_NodalProjector.cpp b/Projections/hydro_NodalProjector.cpp
index 99deec88f..62ae58104 100644
--- a/Projections/hydro_NodalProjector.cpp
+++ b/Projections/hydro_NodalProjector.cpp
@@ -139,7 +139,12 @@ void NodalProjector::define (LPInfo const& a_lpinfo)
 #endif
     }
 
-    m_linop->setGaussSeidel(true);
+    bool use_gauss_seidel = true;
+    {
+        ParmParse pp("nodal_proj");
+        pp.query("use_gauss_seidel", use_gauss_seidel);
+    }
+    m_linop->setGaussSeidel(use_gauss_seidel);
     m_linop->setHarmonicAverage(false);
 
     //