1 files changed, 96 insertions, 0 deletions
diff --git a/src/InitialData.F b/src/InitialData.F
new file mode 100644
index 0000000..1f12a5f
--- /dev/null
+++ b/src/InitialData.F
@@ -0,0 +1,96 @@
+ /*@@
+   @file      InitialData.F
+   @date      
+   @author    Tom Goodale
+   @desc 
+              Initial data for the 3D Wave Equation
+   @enddesc 
+ @@*/
+
+#include "cctk.h" 
+#include "cctk_parameters.h"
+#include "cctk_arguments.h"
+
+
+
+ /*@@
+   @routine    WaveToyF90_InitialData
+   @date       
+   @author     Tom Goodale
+   @desc 
+               Set up initial data for the wave equation
+   @enddesc 
+   @calls      
+   @calledby   
+   @history 
+ 
+   @endhistory 
+
+@@*/
+
+      subroutine WaveToyF90_InitialData(CCTK_FARGUMENTS)
+
+      implicit none
+
+      DECLARE_CCTK_FARGUMENTS
+      DECLARE_CCTK_PARAMETERS
+
+      INTEGER CCTK_Equals
+
+      INTEGER   :: i
+      CCTK_REAL :: dt,omega, pi
+      CCTK_REAL :: min_delta,dx,dy,dz
+
+      pi = 4.0*atan(1.0)
+
+c     Grid spacing shortcuts
+c     ----------------------
+      dx = cctk_delta_space(1)
+      dy = cctk_delta_space(2)
+      dz = cctk_delta_space(3)
+
+c     Calculate timestep
+c     ------------------
+      min_delta = min(dx,dy,dz)
+      cctk_delta_time = dtfac*min_delta
+      dt = cctk_delta_time
+      omega = sqrt(kx**2+ky**2+kz**2)
+
+      if (CCTK_Equals(initial_data,"plane")==1) then 
+
+         phi     = amplitude*cos(kx*x+ky*y+kz*z+omega*cctk_time)
+         phi_old = amplitude*cos(kx*x+ky*y+kz*z+omega*(cctk_time-dt))
+
+      else if (CCTK_Equals(initial_data,"gaussian")==1) then 
+
+         call CCTK_INFO("Gaussian initial data for Wave Equation");
+         phi     = amplitude*exp( -(sqrt(x**2+y**2+z**2)-radius)**2/sigma**2)
+         phi_old = amplitude*exp( -(sqrt(x**2+y**2+z**2)-radius-dt)**2/sigma**2)
+
+      else if (CCTK_Equals(initial_data, "box")==1) then
+
+c        Use kx,ky,kz as number of modes in each direction.
+
+         phi = amplitude*sin(kx*(x-0.5)*pi)*
+     $        sin(ky*(y-0.5)*pi)*
+     $        sin(kz*(z-0.5)*pi)*
+     $        cos(omega*cctk_time*pi)
+            
+         phi_old = amplitude*sin(kx*(x-0.5)*pi)*
+     $        sin(ky*(y-0.5)*pi)*
+     $        sin(kz*(z-0.5)*pi)*
+     $        cos(omega*(cctk_time-dt)*pi)
+
+      end if
+
+c     Apply symmetry boundary conditions
+c     ----------------------------------
+      call ApplySymmetry(cctkGH,"wavetoy::scalarevolve")
+
+c     Synchronise
+c     -----------
+      call CCTK_SyncGroup(cctkGH,"wavetoy::scalarevolve")
+
+      end subroutine WaveToyF90_InitialData
+
+