mat_Fe = mag.MagMaterial("Fe", Ms=1.2, A=4.0, extra_H="""H_total_Fe(0) -= mag[0]*1.2; if(X(0)<0.01 || X(0)>2.99) /* pin the M field at boundaries */ { H_total_Fe(0)=0.0; H_total_Fe(1)=0.0; H_total_Fe(2)=0.0; } """) mag.set_local_magnetic_coupling(mat_Dy, mat_Fe, -80.0) mag.defregion("DyFe2", nm.box([1.0], [2.0]), mag_mat=[mat_Dy, mat_Fe]) mag.defregion( "YFe2", nm.union([nm.box([0.0], [1.0]), nm.box([2.0], [3.0])]), mag_mat=mat_Fe # can pass either a material or a list of materials ) mag.set_meshing_parameters( cache_name="exchange-spring-mesh", bounding_box=([-1.0], [5.0]), a0=0.25, max_steps=100, ) mag.create_mesh()
mat_Fe = mag.MagMaterial("Fe",Ms=1.2,A=4.0, extra_H="""H_total_Fe(0) -= mag[0]*1.2; if(X(0)<0.01 || X(0)>2.99) /* pin the M field at boundaries */ { H_total_Fe(0)=0.0; H_total_Fe(1)=0.0; H_total_Fe(2)=0.0; } """ ) mag.set_local_magnetic_coupling(mat_Dy,mat_Fe,-80.0) mag.defregion("DyFe2",nm.box([1.0],[2.0]), mag_mat=[mat_Dy,mat_Fe] ) mag.defregion("YFe2", nm.union([nm.box([0.0],[1.0]),nm.box([2.0],[3.0])]), mag_mat=mat_Fe # can pass either a material or a list of materials ) mag.set_meshing_parameters(cache_name="exchange-spring-mesh", bounding_box=([-1.0],[5.0]), a0=0.25, max_steps=100, ) mag.create_mesh()
#mag.set_intensive_parameters(["H_x","H_y","H_z"], # may also set T,p,E, etc. # external_magnetization=["H_x","H_y","H_z"]) # ^ XXX not used yet, as we are going to use the experimental cvode integrator... mag.set_intensive_parameters([]) # mag.set_default_order(1) # default anyway... mag.set_features({"demag":True,"exchange":True,"timestep":True}) # XXX change usage! mat_Py = mag.MagMaterial("Py",Ms=1.0,A=13.0, # A = exchange constant ) mag.defregion("Py", nm.ellipsoid([3.0,3.0,3.0]), mag_mat=mat_Py) mag.set_meshing_parameters(cache_name="exchange-spring-mesh", bounding_box=([-4.0,-4.0,-4.0],[4.0,4.0,4.0]), a0=1.0, max_steps=600, ) mag.create_mesh() mag.set_magnetization([0.0,0.0,1.0]) # providing a vector rather than a function import nfem.visual nfem.visual.fields2vtkfile([mag.default_simulation_context.field_M],'sphere-initial.vtk',mesh=mag.default_simulation_context.mesh)
h_total_Funny[2] += 0.0; """) mag.set_default_material(PermAlloy) mag.set_intensive_parameters(["T", "p", "H_x", "H_y", "H_z"]) #mag.defregion("Ball 1",nm.ellipsoid([3.0,3.0,3.0],transform=[("shift",[-3.0,0.0,0.0])])) print "OK 1" sys.stdout.flush() #mag.defregion("Ball 2",nm.ellipsoid([3.0,3.0,3.0],transform=[("shift",[3.0,0.0,0.0])])) mag.defregion( "Ball 2", nm.ellipsoid([2.0, 2.0, 2.0], transform=[("shift", [3.0, 0.0, 0.0])])) # Note: clearly, we DO need a better way to specify geometries. Ideally, I would like to be # able to write instead: # # mag.defregion("Ball 1",nm.shifted([-3,0,0],nm.sphere(3))) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],nm.sphere(3))) # # or alternatively: # # sphere = nm.sphere(3) # mag.defregion("Ball 1",nm.shifted([-3,0,0],sphere)) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],sphere)) mag.set_meshing_parameters(cache_name="two-balls")
h_total_Funny[2] += 0.0; """) mag.set_default_material(PermAlloy) mag.set_intensive_parameters(["T","p","H_x","H_y","H_z"]) #mag.defregion("Ball 1",nm.ellipsoid([3.0,3.0,3.0],transform=[("shift",[-3.0,0.0,0.0])])) print "OK 1" sys.stdout.flush() #mag.defregion("Ball 2",nm.ellipsoid([3.0,3.0,3.0],transform=[("shift",[3.0,0.0,0.0])])) mag.defregion("Ball 2",nm.ellipsoid([2.0,2.0,2.0],transform=[("shift",[3.0,0.0,0.0])])) # Note: clearly, we DO need a better way to specify geometries. Ideally, I would like to be # able to write instead: # # mag.defregion("Ball 1",nm.shifted([-3,0,0],nm.sphere(3))) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],nm.sphere(3))) # # or alternatively: # # sphere = nm.sphere(3) # mag.defregion("Ball 1",nm.shifted([-3,0,0],sphere)) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],sphere)) mag.set_meshing_parameters(cache_name="two-balls")