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<p class="MsoNormal"><span lang="EN-US">Hello, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am using petsc DMSwarm library for some Lagrangian particle tracking. Until now, I was working in a closed box and was therefore initializing my swarm object as:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">// Create a DMDA staggered and without ghost cells (for DMSwarm to work)</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMDACreate3d(PETSC_COMM_WORLD,DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,N,P,m,n,p,1,1,lx,ly,lz,da_swarm);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="apple-converted-space"><span lang="EN-US"><o:p> </o:p></span></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSetFromOptions(*da_swarm);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSetUp(*da_swarm);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">PetscScalar xmin, xmax, ymin, ymax, zmin, zmax;</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">xmin = ymin = zmin = 0.;</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">xmax = ymax = zmax = 1.;</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMDASetUniformCoordinates(*da_swarm,xmin, xmax, ymin, ymax, zmin, zmax);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">//SetNonUniform3DCoordinates(*da_swarm, cornp, gridp, rank);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p2"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">/* Create a DMShell for point location purposes */</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMShellCreate(PETSC_COMM_WORLD,dmcell);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSetApplicationContext(*dmcell,*da_swarm);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">(*dmcell)->ops->locatepoints = DMLocatePoints_DMDARegular;</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="apple-converted-space"><span lang="EN-US"></span></span><span class="s1"><span lang="EN-US">(*dmcell)->ops->getneighbors = DMGetNeighbors_DMDARegular;</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p2"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">// Create a Swarm DMDA</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMCreate(PETSC_COMM_WORLD,swarm);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSetType(*swarm,DMSWARM);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSetDimension(*swarm,3);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSwarmSetType(*swarm,DMSWARM_PIC);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="p1"><span class="s1"><span lang="EN-US">DMSwarmSetCellDM(*swarm,*dmcell);</span></span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am now trying to work with periodic boundary conditions. I tried replacing
<span class="s1">DM_BOUNDARY_NONE by DM_BOUNDARY_PERIODIC but it does not work… I checked for examples using periodic B.C. but have not found any. Is it possible? And if yes, how can I make it work?
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="s1"><span lang="EN-US"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span class="s1"><span lang="EN-US">Thanks a lot for your answer.
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="s1"><span lang="EN-US">Best regards, <o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="s1"><span lang="EN-US"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span class="s1"><span lang="EN-US">Joauma</span></span><span lang="EN-US"><o:p></o:p></span></p>
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