This module defines the procedures of a physics module. It contains function pointers for the various supported routines. An actual physics module has to set these pointers to its implementation of these routines. More...
Data Types | |
| interface | sub_check_params |
| interface | sub_set_mg_bounds |
| interface | sub_boundary_adjust |
| interface | sub_convert |
| interface | sub_modify_wLR |
| interface | sub_get_cmax |
| interface | sub_get_a2max |
| interface | sub_get_tcutoff |
| interface | sub_trac_after_setdt |
| interface | sub_get_v |
| interface | sub_get_H_speed |
| interface | sub_get_cbounds |
| interface | sub_get_flux |
| interface | sub_add_source_geom |
| interface | sub_add_source |
| interface | sub_global_source |
| Add global source terms on complete domain (potentially implicit) More... | |
| interface | sub_clean_divb |
| clean initial divb More... | |
| interface | sub_set_equi_vars |
| set equilibrium variables other than b0 (e.g. p0 and rho0) More... | |
| interface | sub_special_advance |
| Add special advance in each advect step. More... | |
| interface | sub_get_dt |
| interface | sub_check_w |
| interface | sub_get_pthermal |
| interface | sub_get_auxiliary |
| interface | sub_get_auxiliary_prim |
| interface | sub_get_tgas |
| interface | sub_get_trad |
| interface | sub_write_info |
| interface | sub_small_values |
| interface | sub_get_var |
| interface | sub_get_ct_velocity |
| interface | sub_update_faces |
| interface | sub_face_to_center |
| interface | sub_evaluate_implicit |
| interface | sub_implicit_update |
| interface | sub_update_temperature |
Functions/Subroutines | |
| subroutine | phys_check () |
| subroutine | dummy_init_params |
| subroutine | dummy_check_params |
| subroutine | dummy_modify_wlr (ixIL, ixOL, qt, wLC, wRC, wLp, wRp, s, idir) |
| subroutine | dummy_get_h_speed (wprim, x, ixIL, ixOL, idim, Hspeed) |
| subroutine | dummy_get_a2max (w, x, ixIL, ixOL, a2max) |
| subroutine | dummy_add_source_geom (qdt, dtfactor, ixIL, ixOL, wCT, w, x) |
| subroutine | dummy_add_source (qdt, dtfactor, ixIL, ixOL, wCT, wCTprim, w, x, qsourcesplit, active) |
| subroutine | dummy_check_w (primitive, ixIL, ixOL, w, w_flag) |
| subroutine | dummy_get_pthermal (w, x, ixIL, ixOL, pth) |
| subroutine | dummy_get_auxiliary (ixIL, ixOL, w, x) |
| subroutine | dummy_get_auxiliary_prim (ixIL, ixOL, w) |
| subroutine | dummy_boundary_adjust (igrid, psb) |
| subroutine | dummy_write_info (fh) |
| subroutine | dummy_small_values (primitive, w, x, ixIL, ixOL, subname) |
| subroutine | dummy_get_ct_velocity (vcts, wLp, wRp, ixIL, ixOL, idim, cmax, cmin) |
| subroutine | dummy_update_faces (ixIL, ixOL, qt, qdt, wprim, fC, fE, sCT, s, vcts) |
| subroutine | dummy_face_to_center (ixOL, s) |
| subroutine | dummy_evaluate_implicit (qtC, psa) |
| subroutine | dummy_implicit_update (dtfactor, qdt, qtC, psa, psb) |
Variables | |
| double precision | phys_gamma =5.d0/3.d0 |
| character(len=name_len) | physics_type = "" |
| String describing the physics type of the simulation. More... | |
| integer | phys_wider_stencil = 0 |
| To use wider stencils in flux calculations. A value of 1 will extend it by one cell in both directions, in any dimension. More... | |
| logical | phys_req_diagonal = .true. |
| Whether the physics routines require diagonal ghost cells, for example for computing a curl. More... | |
| logical | phys_energy =.false. |
| Solve energy equation or not. More... | |
| logical | phys_total_energy =.false. |
| Solve total energy equation or not. More... | |
| logical | phys_internal_e =.false. |
| Solve internal energy instead of total energy. More... | |
| logical | phys_partial_ionization =.false. |
| Solve partially ionized one-fluid plasma. More... | |
| logical | phys_equi_pe =.false. |
| if equilibrium pressure is splitted More... | |
| integer, dimension(:, :), allocatable | flux_type |
| Array per direction per variable, which can be used to specify that certain fluxes have to be treated differently. More... | |
| integer, parameter | flux_default = 0 |
| Indicates a normal flux. More... | |
| integer, parameter | flux_tvdlf = 1 |
| Indicates the flux should be treated with tvdlf. More... | |
| integer, parameter | flux_no_dissipation = 2 |
| Indicates dissipation should be omitted. More... | |
| integer, parameter | flux_special = 3 |
| Indicates the flux should be specially treated. More... | |
| integer, parameter | flux_hll = 4 |
| Indicates the flux should be treated with hll. More... | |
| procedure(sub_check_params), pointer | phys_check_params => null() |
| procedure(sub_set_mg_bounds), pointer | phys_set_mg_bounds => null() |
| procedure(sub_convert), pointer | phys_to_conserved => null() |
| procedure(sub_convert), pointer | phys_to_primitive => null() |
| procedure(sub_modify_wlr), pointer | phys_modify_wlr => null() |
| procedure(sub_get_cmax), pointer | phys_get_cmax => null() |
| procedure(sub_get_a2max), pointer | phys_get_a2max => null() |
| procedure(sub_get_tcutoff), pointer | phys_get_tcutoff => null() |
| procedure(sub_trac_after_setdt), pointer | phys_trac_after_setdt => null() |
| procedure(sub_get_h_speed), pointer | phys_get_h_speed => null() |
| procedure(sub_get_cbounds), pointer | phys_get_cbounds => null() |
| procedure(sub_get_flux), pointer | phys_get_flux => null() |
| procedure(sub_get_v), pointer | phys_get_v => null() |
| procedure(sub_get_dt), pointer | phys_get_dt => null() |
| procedure(sub_add_source_geom), pointer | phys_add_source_geom => null() |
| procedure(sub_add_source), pointer | phys_add_source => null() |
| procedure(sub_global_source), pointer | phys_global_source_after => null() |
| procedure(sub_special_advance), pointer | phys_special_advance => null() |
| procedure(sub_check_w), pointer | phys_check_w => null() |
| procedure(sub_get_pthermal), pointer | phys_get_pthermal => null() |
| procedure(sub_get_tgas), pointer | phys_get_tgas => null() |
| procedure(sub_get_trad), pointer | phys_get_trad => null() |
| procedure(sub_boundary_adjust), pointer | phys_boundary_adjust => null() |
| procedure(sub_write_info), pointer | phys_write_info => null() |
| procedure(sub_small_values), pointer | phys_handle_small_values => null() |
| procedure(sub_get_ct_velocity), pointer | phys_get_ct_velocity => null() |
| procedure(sub_update_faces), pointer | phys_update_faces => null() |
| procedure(sub_face_to_center), pointer | phys_face_to_center => null() |
| procedure(sub_implicit_update), pointer | phys_implicit_update => null() |
| procedure(sub_evaluate_implicit), pointer | phys_evaluate_implicit => null() |
| procedure(sub_clean_divb), pointer | phys_clean_divb => null() |
| procedure(sub_set_equi_vars), pointer | phys_set_equi_vars => null() |
| procedure(sub_check_params), pointer | phys_te_images => null() |
| procedure(sub_update_temperature), pointer | phys_update_temperature => null() |
| procedure(sub_get_auxiliary), pointer | phys_get_auxiliary => null() |
| procedure(sub_get_auxiliary_prim), pointer | phys_get_auxiliary_prim => null() |
Detailed Description
This module defines the procedures of a physics module. It contains function pointers for the various supported routines. An actual physics module has to set these pointers to its implementation of these routines.
Function/Subroutine Documentation
◆ dummy_add_source()
| subroutine mod_physics::dummy_add_source | ( | double precision, intent(in) | qdt, |
| double precision, intent(in) | dtfactor, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ixi^s, 1:nw), intent(in) | wCT, | ||
| double precision, dimension(ixi^s,1:nw), intent(in) | wCTprim, | ||
| double precision, dimension(ixi^s, 1:nw), intent(inout) | w, | ||
| double precision, dimension(ixi^s, 1:ndim), intent(in) | x, | ||
| logical, intent(in) | qsourcesplit, | ||
| logical, intent(inout) | active | ||
| ) |
Definition at line 491 of file mod_physics.t.
◆ dummy_add_source_geom()
| subroutine mod_physics::dummy_add_source_geom | ( | double precision, intent(in) | qdt, |
| double precision, intent(in) | dtfactor, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ixi^s, 1:nw), intent(inout) | wCT, | ||
| double precision, dimension(ixi^s, 1:nw), intent(inout) | w, | ||
| double precision, dimension(ixi^s, 1:^nd), intent(in) | x | ||
| ) |
Definition at line 484 of file mod_physics.t.
◆ dummy_boundary_adjust()
| subroutine mod_physics::dummy_boundary_adjust | ( | integer, intent(in) | igrid, |
| type(state), dimension(max_blocks), target | psb | ||
| ) |
Definition at line 546 of file mod_physics.t.
◆ dummy_check_params()
| subroutine mod_physics::dummy_check_params |
Definition at line 455 of file mod_physics.t.
◆ dummy_check_w()
| subroutine mod_physics::dummy_check_w | ( | logical, intent(in) | primitive, |
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ixi^s,1:nw), intent(in) | w, | ||
| logical, dimension(ixi^s,1:nw), intent(inout) | w_flag | ||
| ) |
Definition at line 503 of file mod_physics.t.
◆ dummy_evaluate_implicit()
| subroutine mod_physics::dummy_evaluate_implicit | ( | double precision, intent(in) | qtC, |
| type(state), dimension(max_blocks), target | psa | ||
| ) |
Definition at line 601 of file mod_physics.t.
◆ dummy_face_to_center()
| subroutine mod_physics::dummy_face_to_center | ( | integer, intent(in) | ixO, |
| integer, intent(in) | L, | ||
| type(state) | s | ||
| ) |
Definition at line 595 of file mod_physics.t.
◆ dummy_get_a2max()
| subroutine mod_physics::dummy_get_a2max | ( | double precision, dimension(ixi^s, nw), intent(in) | w, |
| double precision, dimension(ixi^s, 1:^nd), intent(in) | x, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ndim), intent(inout) | a2max | ||
| ) |
◆ dummy_get_auxiliary()
| subroutine mod_physics::dummy_get_auxiliary | ( | integer, intent(in) | ixI, |
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ixi^s, nw), intent(inout) | w, | ||
| double precision, dimension(ixi^s, 1:ndim), intent(in) | x | ||
| ) |
◆ dummy_get_auxiliary_prim()
| subroutine mod_physics::dummy_get_auxiliary_prim | ( | integer, intent(in) | ixI, |
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ixi^s, nw), intent(inout) | w | ||
| ) |
◆ dummy_get_ct_velocity()
| subroutine mod_physics::dummy_get_ct_velocity | ( | type(ct_velocity), intent(inout) | vcts, |
| double precision, dimension(ixi^s, nw), intent(in) | wLp, | ||
| double precision, dimension(ixi^s, nw), intent(in) | wRp, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| integer, intent(in) | idim, | ||
| double precision, dimension(ixi^s), intent(in) | cmax, | ||
| double precision, dimension(ixi^s), intent(in), optional | cmin | ||
| ) |
Definition at line 573 of file mod_physics.t.
◆ dummy_get_h_speed()
| subroutine mod_physics::dummy_get_h_speed | ( | double precision, dimension(ixi^s, nw), intent(in) | wprim, |
| double precision, dimension(ixi^s,1:ndim), intent(in) | x, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| integer, intent(in) | idim, | ||
| double precision, dimension(ixi^s,1:number_species), intent(out) | Hspeed | ||
| ) |
Definition at line 467 of file mod_physics.t.
◆ dummy_get_pthermal()
| subroutine mod_physics::dummy_get_pthermal | ( | double precision, dimension(ixi^s, nw), intent(in) | w, |
| double precision, dimension(ixi^s, 1:ndim), intent(in) | x, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, dimension(ixi^s), intent(out) | pth | ||
| ) |
◆ dummy_implicit_update()
| subroutine mod_physics::dummy_implicit_update | ( | double precision, intent(in) | dtfactor, |
| double precision, intent(in) | qdt, | ||
| double precision, intent(in) | qtC, | ||
| type(state), dimension(max_blocks), target | psa, | ||
| type(state), dimension(max_blocks), target | psb | ||
| ) |
Definition at line 617 of file mod_physics.t.
◆ dummy_init_params()
| subroutine mod_physics::dummy_init_params |
Definition at line 452 of file mod_physics.t.
◆ dummy_modify_wlr()
| subroutine mod_physics::dummy_modify_wlr | ( | integer, intent(in) | ixI, |
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, intent(in) | qt, | ||
| double precision, dimension(ixi^s,1:nw), intent(inout) | wLC, | ||
| double precision, dimension(ixi^s,1:nw), intent(inout) | wRC, | ||
| double precision, dimension(ixi^s,1:nw), intent(inout) | wLp, | ||
| double precision, dimension(ixi^s,1:nw), intent(inout) | wRp, | ||
| type(state) | s, | ||
| integer, intent(in) | idir | ||
| ) |
Definition at line 458 of file mod_physics.t.
◆ dummy_small_values()
| subroutine mod_physics::dummy_small_values | ( | logical, intent(in) | primitive, |
| double precision, dimension(ixi^s,1:nw), intent(inout) | w, | ||
| double precision, dimension(ixi^s,1:ndim), intent(in) | x, | ||
| integer, intent(in) | ixI, | ||
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| character(len=*), intent(in) | subname | ||
| ) |
Definition at line 564 of file mod_physics.t.
◆ dummy_update_faces()
| subroutine mod_physics::dummy_update_faces | ( | integer, intent(in) | ixI, |
| integer, intent(in) | L, | ||
| integer, intent(in) | ixO, | ||
| L, | |||
| double precision, intent(in) | qt, | ||
| double precision, intent(in) | qdt, | ||
| double precision, dimension(ixi^s,1:nw), intent(in) | wprim, | ||
| double precision, dimension(ixi^s,1:nwflux,1:ndim), intent(in) | fC, | ||
| double precision, dimension(ixi^s,sdim:3), intent(inout) | fE, | ||
| type(state) | sCT, | ||
| type(state) | s, | ||
| type(ct_velocity) | vcts | ||
| ) |
Definition at line 583 of file mod_physics.t.
◆ dummy_write_info()
| subroutine mod_physics::dummy_write_info | ( | integer, intent(in) | fh | ) |
- Parameters
-
[in] fh File handle
Definition at line 552 of file mod_physics.t.
◆ phys_check()
| subroutine mod_physics::phys_check |
Variable Documentation
◆ flux_default
| integer, parameter mod_physics::flux_default = 0 |
Indicates a normal flux.
Definition at line 46 of file mod_physics.t.
◆ flux_hll
| integer, parameter mod_physics::flux_hll = 4 |
Indicates the flux should be treated with hll.
Definition at line 54 of file mod_physics.t.
◆ flux_no_dissipation
| integer, parameter mod_physics::flux_no_dissipation = 2 |
Indicates dissipation should be omitted.
Definition at line 50 of file mod_physics.t.
◆ flux_special
| integer, parameter mod_physics::flux_special = 3 |
Indicates the flux should be specially treated.
Definition at line 52 of file mod_physics.t.
◆ flux_tvdlf
| integer, parameter mod_physics::flux_tvdlf = 1 |
Indicates the flux should be treated with tvdlf.
Definition at line 48 of file mod_physics.t.
◆ flux_type
| integer, dimension(:, :), allocatable mod_physics::flux_type |
Array per direction per variable, which can be used to specify that certain fluxes have to be treated differently.
Definition at line 43 of file mod_physics.t.
◆ phys_add_source
| procedure(sub_add_source), pointer mod_physics::phys_add_source => null() |
Definition at line 71 of file mod_physics.t.
◆ phys_add_source_geom
| procedure(sub_add_source_geom), pointer mod_physics::phys_add_source_geom => null() |
Definition at line 70 of file mod_physics.t.
◆ phys_boundary_adjust
| procedure(sub_boundary_adjust), pointer mod_physics::phys_boundary_adjust => null() |
Definition at line 78 of file mod_physics.t.
◆ phys_check_params
| procedure(sub_check_params), pointer mod_physics::phys_check_params => null() |
Definition at line 56 of file mod_physics.t.
◆ phys_check_w
| procedure(sub_check_w), pointer mod_physics::phys_check_w => null() |
Definition at line 74 of file mod_physics.t.
◆ phys_clean_divb
| procedure(sub_clean_divb), pointer mod_physics::phys_clean_divb => null() |
Definition at line 86 of file mod_physics.t.
◆ phys_energy
| logical mod_physics::phys_energy =.false. |
Solve energy equation or not.
Definition at line 27 of file mod_physics.t.
◆ phys_equi_pe
| logical mod_physics::phys_equi_pe =.false. |
if equilibrium pressure is splitted
Definition at line 39 of file mod_physics.t.
◆ phys_evaluate_implicit
| procedure(sub_evaluate_implicit), pointer mod_physics::phys_evaluate_implicit => null() |
Definition at line 85 of file mod_physics.t.
◆ phys_face_to_center
| procedure(sub_face_to_center), pointer mod_physics::phys_face_to_center => null() |
Definition at line 83 of file mod_physics.t.
◆ phys_gamma
| double precision mod_physics::phys_gamma =5.d0/3.d0 |
Definition at line 13 of file mod_physics.t.
◆ phys_get_a2max
| procedure(sub_get_a2max), pointer mod_physics::phys_get_a2max => null() |
Definition at line 62 of file mod_physics.t.
◆ phys_get_auxiliary
| procedure(sub_get_auxiliary), pointer mod_physics::phys_get_auxiliary => null() |
Definition at line 93 of file mod_physics.t.
◆ phys_get_auxiliary_prim
| procedure(sub_get_auxiliary_prim), pointer mod_physics::phys_get_auxiliary_prim => null() |
Definition at line 94 of file mod_physics.t.
◆ phys_get_cbounds
| procedure(sub_get_cbounds), pointer mod_physics::phys_get_cbounds => null() |
Definition at line 66 of file mod_physics.t.
◆ phys_get_cmax
| procedure(sub_get_cmax), pointer mod_physics::phys_get_cmax => null() |
Definition at line 61 of file mod_physics.t.
◆ phys_get_ct_velocity
| procedure(sub_get_ct_velocity), pointer mod_physics::phys_get_ct_velocity => null() |
Definition at line 81 of file mod_physics.t.
◆ phys_get_dt
| procedure(sub_get_dt), pointer mod_physics::phys_get_dt => null() |
Definition at line 69 of file mod_physics.t.
◆ phys_get_flux
| procedure(sub_get_flux), pointer mod_physics::phys_get_flux => null() |
Definition at line 67 of file mod_physics.t.
◆ phys_get_h_speed
| procedure(sub_get_h_speed), pointer mod_physics::phys_get_h_speed => null() |
Definition at line 65 of file mod_physics.t.
◆ phys_get_pthermal
| procedure(sub_get_pthermal), pointer mod_physics::phys_get_pthermal => null() |
Definition at line 75 of file mod_physics.t.
◆ phys_get_tcutoff
| procedure(sub_get_tcutoff), pointer mod_physics::phys_get_tcutoff => null() |
Definition at line 63 of file mod_physics.t.
◆ phys_get_tgas
| procedure(sub_get_tgas), pointer mod_physics::phys_get_tgas => null() |
Definition at line 76 of file mod_physics.t.
◆ phys_get_trad
| procedure(sub_get_trad), pointer mod_physics::phys_get_trad => null() |
Definition at line 77 of file mod_physics.t.
◆ phys_get_v
| procedure(sub_get_v), pointer mod_physics::phys_get_v => null() |
Definition at line 68 of file mod_physics.t.
◆ phys_global_source_after
| procedure(sub_global_source), pointer mod_physics::phys_global_source_after => null() |
Definition at line 72 of file mod_physics.t.
◆ phys_handle_small_values
| procedure(sub_small_values), pointer mod_physics::phys_handle_small_values => null() |
Definition at line 80 of file mod_physics.t.
◆ phys_implicit_update
| procedure(sub_implicit_update), pointer mod_physics::phys_implicit_update => null() |
Definition at line 84 of file mod_physics.t.
◆ phys_internal_e
| logical mod_physics::phys_internal_e =.false. |
Solve internal energy instead of total energy.
Definition at line 33 of file mod_physics.t.
◆ phys_modify_wlr
| procedure(sub_modify_wlr), pointer mod_physics::phys_modify_wlr => null() |
Definition at line 60 of file mod_physics.t.
◆ phys_partial_ionization
| logical mod_physics::phys_partial_ionization =.false. |
Solve partially ionized one-fluid plasma.
Definition at line 36 of file mod_physics.t.
◆ phys_req_diagonal
| logical mod_physics::phys_req_diagonal = .true. |
Whether the physics routines require diagonal ghost cells, for example for computing a curl.
Definition at line 24 of file mod_physics.t.
◆ phys_set_equi_vars
| procedure(sub_set_equi_vars), pointer mod_physics::phys_set_equi_vars => null() |
Definition at line 88 of file mod_physics.t.
◆ phys_set_mg_bounds
| procedure(sub_set_mg_bounds), pointer mod_physics::phys_set_mg_bounds => null() |
Definition at line 57 of file mod_physics.t.
◆ phys_special_advance
| procedure(sub_special_advance), pointer mod_physics::phys_special_advance => null() |
Definition at line 73 of file mod_physics.t.
◆ phys_te_images
| procedure(sub_check_params), pointer mod_physics::phys_te_images => null() |
Definition at line 90 of file mod_physics.t.
◆ phys_to_conserved
| procedure(sub_convert), pointer mod_physics::phys_to_conserved => null() |
Definition at line 58 of file mod_physics.t.
◆ phys_to_primitive
| procedure(sub_convert), pointer mod_physics::phys_to_primitive => null() |
Definition at line 59 of file mod_physics.t.
◆ phys_total_energy
| logical mod_physics::phys_total_energy =.false. |
Solve total energy equation or not.
Definition at line 30 of file mod_physics.t.
◆ phys_trac_after_setdt
| procedure(sub_trac_after_setdt), pointer mod_physics::phys_trac_after_setdt => null() |
Definition at line 64 of file mod_physics.t.
◆ phys_update_faces
| procedure(sub_update_faces), pointer mod_physics::phys_update_faces => null() |
Definition at line 82 of file mod_physics.t.
◆ phys_update_temperature
| procedure(sub_update_temperature), pointer mod_physics::phys_update_temperature => null() |
Definition at line 92 of file mod_physics.t.
◆ phys_wider_stencil
| integer mod_physics::phys_wider_stencil = 0 |
To use wider stencils in flux calculations. A value of 1 will extend it by one cell in both directions, in any dimension.
Definition at line 20 of file mod_physics.t.
◆ phys_write_info
| procedure(sub_write_info), pointer mod_physics::phys_write_info => null() |
Definition at line 79 of file mod_physics.t.
◆ physics_type
| character(len=name_len) mod_physics::physics_type = "" |
String describing the physics type of the simulation.
Definition at line 16 of file mod_physics.t.
