simple subgridding example

user_models/example_subgrid.py

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+import gprMax
+
+scene = gprMax.Scene()
+
+# global configuration
+# objects within the inner surface can be positioned automatically
+# in this configuration coordinates in the main grid Space
+# are converted to subgrid local space automatically
+# if objects or required in the region between the inner Surface
+# and the outer surface autotranslate must be set to False
+# and the local position must be set explicitly. Addionally,
+# in this instance, objects which occur within the IS OS gap
+# must be positioned in the subgrid and the main grid.
+gprMax.config.general['autotranslate'] = True
+
+# Points are specified as iterables
+p1 = (1, 1, 1)
+
+# single objects
+dxdydz = gprMax.Discretisation(p1=(1e-2, 1e-2, 1e-2))
+messages = gprMax.Messages(yn='y')
+tw = gprMax.TimeWindow(iterations=250)
+domain = gprMax.Domain(p1=p1)
+title = gprMax.Title(name='mysimulation')
+waveform = gprMax.Waveform(wave_type='gaussiandotnorm', amp=1, freq=400e6, id='mywaveform')
+
+# position in subgrid automatically
+dipole = gprMax.HertzianDipole(p1=(0.5, 0.5, 0.5), polarisation='y', waveform_id='mywaveform')
+
+# equivalent position when autotranslate is false
+#rx = gprMax.Rx(p1=(50 * 1e-2 / 5, 50 * 1e-2 / 5, 50 * 1e-2 / 5))
+
+# rx in the subgrid
+# subgrid data is stored in an additional output file called
+# outputfile_<subgrid_id>.out
+rx1 = gprMax.Rx(p1=(0.52, 0.5, 0.5))
+
+# rx in the main grid
+rx2 = gprMax.Rx(p1=(0.2, 0.5, 0.5))
+
+# set the position of the Inner Surface
+subgrid = gprMax.SubGridHSG(p1=(45e-2, 45e-2, 45e-2),
+                            p2=(55e-2, 55e-2, 55e-2),
+                            ratio=3,
+                            id='subgrid1',
+                            filter=False)
+                            #pml_separation=6,
+                            #subgrid_pml_thickness=10)
+
+scene = gprMax.Scene()
+scene.add(dxdydz)
+scene.add(messages)
+scene.add(tw)
+scene.add(domain)
+scene.add(title)
+scene.add(subgrid)
+scene.add(rx2)
+
+subgrid.add(waveform)
+subgrid.add(dipole)
+subgrid.add(rx1)
+
+#gprMax.run(scenes=[scene], n=1, geometry_only=False, outputfile='mysimulation', geometry_fixed=False, subgrid=True)
+gprMax.run(scenes=[scene], n=1, geometry_only=False, outputfile='mysimulation', geometry_fixed=False, subgrid=True)