Galilean PSATD with shift (#704)

* Read Galilean velocity

* Prepare structures for Galilean solver

* Started implementing Galilean equations

* Analytical limits for X1, X2, X3, X4 coefficients added

* Slight changes added

* Added Galilean position pusher

* Scale galilean velocity

* Remove unneeded Abort

* Fix Galilean pusher

* Allocate Theta2 array

* Fix definition of coefficients

* Increase guard cells for Galilean

* Add guard cell in particle exchange

* Type corrected

* v_gal added to warpx_current_deposition

* v_gal added to WarpXParticleContainer.H

* Bug fixed  - update particle x-position over one time step

* Fix issues with merge from dev

* Preparation for merging dev into galilean.

* Adding galilean shift

* Implemented galilean shift

* Changed method's name from GalileanShift to ShiftGalileanBoundary

* Added doxygen string for ShiftGalileanBoundary

* Removed never used method LowerCornerWithCentering

* Removed temporary comments

* Removed dt as a variable from DepositCharge method and its dependencies

* Converted tab to spaces

* Removed EOL white space

* Add documentation and automated tests

* Fix compilation error

* Add automated test

* Update automated test

* Removed temporary used galilean shift

* Removed temporary used particle's push for Galilean PSATD

* Removed unused statement

* Remove EOL white space.

* Added zero shift for LowerCorner in RZ geometry

* Minor changes to Galilean implementation

* Modifications for GPU

* Fix typo

Co-authored-by: Remi Lehe <remi.lehe@normalesup.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/Source/Parallelization/GuardCellManager.cpp b/Source/Parallelization/GuardCellManager.cpp
index d845a7447..d7d2bce7c 100644
--- a/Source/Parallelization/GuardCellManager.cpp
+++ b/Source/Parallelization/GuardCellManager.cpp
@@ -24,14 +24,24 @@ guardCellManager::Init(
     const int nci_corr_stencil,
     const int maxwell_fdtd_solver_id,
     const int max_level,
+    const amrex::Array<amrex::Real,3> v_galilean,
     const bool exchange_all_guard_cells)
 {
     // When using subcycling, the particles on the fine level perform two pushes
     // before being redistributed ; therefore, we need one extra guard cell
     // (the particles may move by 2*c*dt)
-    const int ngx_tmp = (max_level > 0 && do_subcycling == 1) ? nox+1 : nox;
-    const int ngy_tmp = (max_level > 0 && do_subcycling == 1) ? nox+1 : nox;
-    const int ngz_tmp = (max_level > 0 && do_subcycling == 1) ? nox+1 : nox;
+    int ngx_tmp = (max_level > 0 && do_subcycling == 1) ? nox+1 : nox;
+    int ngy_tmp = (max_level > 0 && do_subcycling == 1) ? nox+1 : nox;
+    int ngz_tmp = (max_level > 0 && do_subcycling == 1) ? nox+1 : nox;
+
+    if ((v_galilean[0]!=0) or
+        (v_galilean[1]!=0) or
+        (v_galilean[2]!=0)){
+      // Add one guard cell in the case of the galilean algorithm
+      ngx_tmp += 1;
+      ngy_tmp += 1;
+      ngz_tmp += 1;
+    }
 
     // Ex, Ey, Ez, Bx, By, and Bz have the same number of ghost cells.
     // jx, jy, jz and rho have the same number of ghost cells.