{"action":"created","comment":{"url":"https://api.github.com/repos/geodynamics/aspect/pulls/comments/198669064","pull_request_review_id":132641871,"id":198669064,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDE5ODY2OTA2NA==","diff_hunk":"@@ -0,0 +1,174 @@\n+# A simple setup for using the boundary heat flux in a ice viscoplatic model.\n+\n+\n+set Dimension                              = 2\n+set Use years in output instead of seconds = true\n+set End time                               = 1e6\n+set Output directory                       = output-ice-box_2d\n+set Nonlinear solver scheme                = single Advection, iterated Stokes \n+set Nonlinear solver tolerance             = 1e-5\n+set Max nonlinear iterations               = 10\n+set CFL number                             = 0.5\n+set Pressure normalization                 = no\n+set Use conduction timestep                = true\n+# Material model\n+# Rheology: Non-linear viscous flow and Drucker Prager Plasticity\n+# Values for most rheological parameters are specified for a background material and\n+# each compositional field.  Values for viscous deformation are based on diffusion creep \n+# based on Dombard and McKinnon 2006. \n+subsection Material model\n+  set Model name = visco plastic\n+\n+  subsection Visco Plastic\n+\n+    # Reference temperature and viscosity\n+    set Reference temperature = 273 \n+    set Reference viscosity = 1e11\n+\n+    # The minimum strain-rate helps limit large viscosities values that arise\n+    # as the strain-rate approaches zero.\n+    # The reference strain-rate is used on the first non-linear iteration\n+    # of the first time step when the velocity has not been determined yet.\n+    set Minimum strain rate = 1.e-20\n+    set Reference strain rate = 1.e-12\n+\n+    # Limit the viscosity with minimum and maximum values\n+    set Minimum viscosity = 1e10\n+    set Maximum viscosity = 1e22","path":"cookbooks/simple_ice_box.prm","position":37,"original_position":37,"commit_id":"718831957108b4222e5ebbfda7a4c82fac88cd86","original_commit_id":"718831957108b4222e5ebbfda7a4c82fac88cd86","user":{"login":"jonpkay","id":36459877,"node_id":"MDQ6VXNlcjM2NDU5ODc3","avatar_url":"https://avatars2.githubusercontent.com/u/36459877?v=4","gravatar_id":"","url":"https://api.github.com/users/jonpkay","html_url":"https://github.com/jonpkay","followers_url":"https://api.github.com/users/jonpkay/followers","following_url":"https://api.github.com/users/jonpkay/following{/other_user}","gists_url":"https://api.github.com/users/jonpkay/gists{/gist_id}","starred_url":"https://api.github.com/users/jonpkay/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jonpkay/subscriptions","organizations_url":"https://api.github.com/users/jonpkay/orgs","repos_url":"https://api.github.com/users/jonpkay/repos","events_url":"https://api.github.com/users/jonpkay/events{/privacy}","received_events_url":"https://api.github.com/users/jonpkay/received_events","type":"User","site_admin":false},"body":"I need to figure out how to get the viscosity lower if I want there to be some overturn, at least that is what the analytical papers are suggesting. 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This cookbook also includes the new heat flux boundary condition. 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