package swirl_lm

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Defines the type of boundary condition to be used for each variable in a specific boundary. Next id: 7.

Used in: research.simulation.BoundaryCondition.BoundaryInfo, CoordinateBC

• BC_TYPE_UNKNOWN = 0

  The default option where no boundary condition is set. Results in an error if that direction is not periodic.

• BC_TYPE_DIRICHLET = 1

  The Dirichlet boundary condition. A value needs to be specified for this type of boundary condition.

• BC_TYPE_NEUMANN = 2

  The Neumann boundary condition.

• BC_TYPE_NEUMANN_2 = 5

  The Neumann boundary condition estimated with 2nd order scheme.

• BC_TYPE_NO_TOUCH = 3

  Maintains the current value for the specified boundary.

• BC_TYPE_PERIODIC = 4

  The periodic boundary condition.

• BC_TYPE_NONREFLECTING = 6

  The nonreflecting boundary condition. Using the "high" side of the domain as an example, a forward Euler with upwinding scheme is used to solve the boundary: ∂ϕ/∂t = - U* ∂ϕ/∂x In discrete form: ϕⱼⁿ⁺¹ = (1 - Δt U* /Δx) ϕⱼⁿ + (Δt U* /Δx) ϕⱼ₋₁ⁿ Similarly for "low" side of the domain boundary, we have a symmetric case: ∂ϕ/∂t = U* ∂ϕ/∂x In discrete form: ϕⱼⁿ⁺¹ = (1 - Δt U* /Δx) ϕⱼⁿ + (Δt U* /Δx) ϕⱼ₊₁ⁿ In the current implementation, U* is specified by the configuration through the value in the boundary condition and the mode (specified through `boundary_info.bc_params.nonreflecting_bc_mode`) setting as: For NONREFLECTING_LOCAL_MAX mode: U* = abs(max(u + u0, 0)) for the "high" side of the domain, and U* = abs(min(u - u0, 0)) for the "low" side of the domain. For NONREFLECTING_GLOBAL_MEAN mode: U* = abs(global_mean(u) + u0), for the "high" side of the domain, and U* = abs(global_mean(u) - u0), for the "low" side of the domain. For NONREFLECTING_GLOBAL_MAX mode: U* = abs(max(global_max(u), 0) + u0), for the "high" side of the domain, U* = abs(min(global_min(u), 0) - u0), for the "low" side of the domain. where u is the (spatially dependent) velocity field at the boundary (first inner fluid layer), while u0 is value specified for the boundary condition configuration.

Used in: research.simulation.PoissonSolver.FastDiagonalization, research.simulation.PoissonSolver.Multigrid

• optional BoundaryConditionType dim_0 = 1

• optional BoundaryConditionType dim_1 = 2

• optional BoundaryConditionType dim_2 = 3

Used in: GridParametrization

• optional bool dim_0 = 1

• optional bool dim_1 = 2

• optional bool dim_2 = 3

Used in: GridParametrization

• optional File dim_0 = 1

• optional File dim_1 = 2

• optional File dim_2 = 3

Used in: research.simulation.Probe, research.simulation.SwirlLMParameters, GridParametrization

• optional float dim_0 = 1

• optional float dim_1 = 2

• optional float dim_2 = 3

Messages encapsulating 3-D coordinates. Dimensions may correspond to x, y, and z, respectively, but need not.

Used in: research.simulation.PoissonSolver.Multigrid, GridParametrization

• optional int32 dim_0 = 1

• optional int32 dim_1 = 2

• optional int32 dim_2 = 3

Marks strings in proto messages as paths to files, so they can be treated as such (e.g., the path needs to point to an existing file). See file_io.py for functions that work on Files.

Used in: CoordinateFile, InnerContainer

• optional string path = 1

A message that parameterizes a distributed simulation. Next id: 13

Used in: research.simulation.SwirlLMParameters

• optional CoordinateInt computation_shape = 1

  The shape or topology of compute cores.

• optional CoordinateFloat length = 2

  The full grid length in each dimension. This is the length of the grid including padding, if any.

• optional CoordinateInt grid_size = 3

  The grid size per core in each dimension.

• optional CoordinateInt physical_full_grid_size = 9

  The full grid size (over all cores) in each dimension. This is the physical grid size (padding is excluded).

• optional int32 halo_width = 4

  The halo width.

• optional float dt = 5

  The absolute time step per simulation finite difference step.

• optional int32 kernel_size = 6

  The convolutional kernel dimension.

• optional int32 input_chunk_size = 7

  The chunk size for input.

• optional int32 num_output_splits = 8

  The number of splits for processing outputs.

• optional int32 num_boundary_points = 10

• optional CoordinateFile stretched_grid_files = 11

  The paths to files containing stretched grid data.

• optional CoordinateBool periodic = 12

  Specifies if the flow field is periodic in a direction.

Used in: OuterContainer

• optional File single_file = 1

• repeated File repeated_files = 2

• optional InnerContainer small_container = 1

• optional int32 int_field = 2

• repeated int32 repeated_int_field = 3