MeshModifiers
The MeshModifiers system is designed to modify the MooseMesh during the simulation.
Please let us know on GitHub Discussions how you are using the MeshModifiers system so we can include your techniques on this page!
Interaction with other systems
Declaring subdomains and boundaries in the Mesh block
Future subdomains and boundaries that will be created by a MeshModifier may be referred to in the input file for kernels and boundary conditions that are not active on the first time step but will come in as soon as the subdomains/ boundaries are created. When they are parsed in the input file, they cause MOOSE to error because they do not currently exist. To avoid these errors, they should be declared in the ("add_subdomain_ids" / "add_subdomain_names") parameters for subdomains and ("add_sideset_ids" / "add_sideset_names") parameters for boundaries.
Skipping boundary conditions when the variable moves away from the boundary
Boundary conditions could be defined on a boundary, and as the mesh modifiers operate, the variable they apply to may no longer be defined on this boundary. The "skip_execution_outside_variable_domain" parameter of integrated boundary conditions lets the boundary become inactive after the variable has left, partially or totally, the proximity of the boundary. For Dirichlet boundary conditions, no parameter is needed to stop the effect of the boundary condition once the variable is no longer defined near the boundary.
The boundary conditions will become active again if the domain of definition of the variable extends again to touch the boundary.
Available Objects
- Moose App
- ActivateElementsByPathDetermine activated elements.
- ActivateElementsCoupledDetermine activated elements.
- CoupledVarThresholdElementSubdomainModifierModify the element subdomain ID if a coupled variable satisfies the criterion for the threshold (above, equal, or below)
- SidesetAroundSubdomainUpdaterSets up a boundary between inner_subdomains and outer_subdomains
- TimedSubdomainModifierModify element subdomain ID of entire subdomains for given points in time. This mesh modifier only runs on the undisplaced mesh, and it will modify both the undisplaced and the displaced mesh.
- VariableValueElementSubdomainModifierModify the element subdomain ID based on the provided variable value.
Available Actions
- Moose App
- AddMeshModifiersActionAdd a MeshModifier object to the simulation.