Changes between Version 404 and Version 405 of doc/app/initialization_parameters
- Timestamp:
- Oct 4, 2018 4:40:23 PM (6 years ago)
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doc/app/initialization_parameters
v404 v405 1816 1816 }}} 1817 1817 {{{#!td 1818 Scalar flux at the surface (in kg m /s)).\\\\1818 Scalar flux at the surface (in kg m^-2^ s^-1^ (particle flux) or ppm m s^-1^ (gaseous flux)).\\\\ 1819 1819 If a non-zero value is assigned to this parameter, the respective scalar flux value is used as bottom (horizontally homogeneous) boundary condition for the scalar concentration equation. This additionally requires that a Neumann condition must be used for the scalar concentration (see [#bc_s_b bc_s_b]), because otherwise the resolved scale may contribute to the surface flux so that a constant value cannot be guaranteed. Also, changes of the surface scalar concentration (see [#s_surface_initial_change s_surface_initial_change]) are not allowed.\\\\ 1820 1820 If no surface scalar flux is assigned ('''surface_scalarflux''' = ''0.0''), it is calculated at each time step by u,,*,, {{{*}}} s,,*,, (of course only with [#constant_flux_layer constant_flux_layer] switched on). Here, s,,*,, is calculated from Monin-Obukhov similarity theory assuming a logarithmic scalar concentration profile between k=0 and k=1. In this case, a Dirichlet condition (see bc_s_b) must be used as bottom boundary condition for the scalar concentration. … … 1908 1908 }}} 1909 1909 {{{#!td 1910 Scalar flux at the top boundary (in kg m /s).\\\\1910 Scalar flux at the top boundary (in kg m^-2^ s^-1^ (particle flux) or ppm m s^-1^ (gaseous flux)).\\\\ 1911 1911 If a value is assigned to this parameter, the internal two-dimensional surface scalar flux field {{{sswst}}} is initialized with the value of '''top_scalarflux''' as the top (horizontally homogeneous) boundary condition for the scalar equation. This additionally requires that a Neumann condition must be used for the scalar (see [#bc_s_t bc_s_t]), because otherwise the resolved scale may contribute to the top flux so that a constant flux value cannot be guaranteed.\\\\ 1912 1912 '''Note:'''\\ … … 2506 2506 }}} 2507 2507 {{{#!td 2508 Surface value of the passive scalar (in kg ).\\\\2508 Surface value of the passive scalar (in kg m^-3^ (particles) or ppm (gases)).\\\\ 2509 2509 This parameter assigns the value of the passive scalar '''s''' at the surface (k=0). Starting from this value, the initial vertical scalar concentration profile is constructed with [#s_vertical_gradient s_vertical_gradient] and [#s_vertical_gradient_level s_vertical_gradient_level]. 2510 2510 }}} … … 2520 2520 }}} 2521 2521 {{{#!td 2522 Change in surface scalar concentration to be made at the beginning of the 3d run (in kg ).\\\\2522 Change in surface scalar concentration to be made at the beginning of the 3d run (in kg m^-3^ (particles) or ppm (gases)).\\\\ 2523 2523 If '''s_surface_initial_change''' is set to a non-zero value, the near surface scalar flux is not allowed to be given simultaneously (see [#surface_scalarflux surface_scalarflux]). 2524 2524 }}} … … 2534 2534 }}} 2535 2535 {{{#!td 2536 Scalar concentration gradient(s) of the initial scalar concentration profile (in kg / 100 m).\\\\2536 Scalar concentration gradient(s) of the initial scalar concentration profile (in kg m^-3^ / 100 m (particles) or ppm / 100m (gases)).\\\\ 2537 2537 The scalar gradient holds starting from the height level defined by [#s_vertical_gradient_level s_vertical_gradient_level] (precisely: for all uv levels k, where zu(k) > s_vertical_gradient_level, s_init(k) is set: s_init(k) = s_init(k-1) + dzu(k) * '''s_vertical_gradient''') up to the top boundary or up to the next height level defined by s_vertical_gradient_level. A total of 10 different gradients for 11 height intervals (10 intervals if s_vertical_gradient_level(1) = 0.0) can be assigned. The surface scalar value is assigned via [#s_surface s_surface].\\\\ 2538 2538 '''Example:'''\\\\ 2539 2539 '''s_vertical_gradien'''t = ''0.1,'' ''0.05,''\\ 2540 2540 [#s_vertical_gradient_level s_vertical_gradient_level] = ''500.0,'' ''1000.0,''\\\\ 2541 That defines the scalar concentration to be constant with height up to z = 500.0 m with a value given by. For 500.0 m < z <= 1000.0 m the scalar gradient is 0.1 kg / 100 m and for z > 1000.0 m up to the top boundary it is 0.05 kg/ 100 m (it is assumed that the assigned height levels correspond with uv levels).2541 That defines the scalar concentration to be constant with height up to z = 500.0 m with a value given by. For 500.0 m < z <= 1000.0 m the scalar gradient is 0.1 kg m^-3^ / 100 m and for z > 1000.0 m up to the top boundary it is 0.05 kg m^-3^ / 100 m (it is assumed that the assigned height levels correspond with uv levels). 2542 2542 }}} 2543 2543 |---------------- … … 3057 3057 }}} 3058 3058 {{{#!td 3059 Prescribed scalar flux in kg m/s at the five topography faces:\\\\3059 Prescribed scalar flux at the five topography faces (in kg m^-2^ s^-1^ (particle flux) or ppm m s^-1^ (gaseous flux)):\\\\ 3060 3060 '''wall_scalarflux'''(0) top face\\ 3061 3061 '''wall_scalarflux'''(1) left face\\