Changeset 4088 for palm/trunk/SOURCE


Ignore:
Timestamp:
Jul 11, 2019 1:57:56 PM (5 years ago)
Author:
Giersch
Message:

Pressure and density profile calculations revised using basic functions, comments improved, function for ideal gas law revised

Location:
palm/trunk/SOURCE
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • palm/trunk/SOURCE/basic_constants_and_equations_mod.f90

    r4084 r4088  
    2525! -----------------
    2626! $Id$
     27! Comment of barometric formula improved, function for ideal gas law revised
     28!
     29! 4084 2019-07-10 17:09:11Z knoop
    2730! Changed precomputed fractions to be variable based
    2831!
     
    236239!
    237240!--    compute density according to ideal gas law:
    238        ideal_gas_law_rho_pt_0d = p / (r_d * (1.0_wp / exner_function_invers(p)) * t)
     241       ideal_gas_law_rho_pt_0d = p / (r_d * exner_function(p) * t)
    239242
    240243    END FUNCTION ideal_gas_law_rho_pt_0d
     
    255258!
    256259!--    compute density according to ideal gas law:
    257        ideal_gas_law_rho_pt_1d = p / (r_d * (1.0_wp / exner_function_invers(p)) * t)
     260       ideal_gas_law_rho_pt_1d = p / (r_d * exner_function(p) * t)
    258261
    259262    END FUNCTION ideal_gas_law_rho_pt_1d
     
    334337! Description:
    335338! ------------
    336 !> Compute the barometric formula for scalar arguments.
     339!> Compute the barometric formula for scalar arguments. The calculation is
     340!> based on the assumption of a polytropic atmosphere and neutral
     341!> stratification, where the temperature lapse rate is g/cp.
    337342!------------------------------------------------------------------------------!
    338343    FUNCTION barometric_formula_0d( z, t_0, p_0)
     
    354359! Description:
    355360! ------------
    356 !> Compute the barometric formula for 1-D array arguments.
     361!> Compute the barometric formula for 1-D array arguments. The calculation is
     362!> based on the assumption of a polytropic atmosphere and neutral
     363!> stratification, where the temperature lapse rate is g/cp.
    357364!------------------------------------------------------------------------------!
    358365    FUNCTION barometric_formula_1d( z, t_0, p_0)
  • palm/trunk/SOURCE/init_3d_model.f90

    r4048 r4088  
    2525! -----------------
    2626! $Id$
     27! Pressure and density profile calculations revised using basic functions
     28!
     29! 4048 2019-06-21 21:00:21Z knoop
    2730! Further modularization of particle code components
    2831!
     
    845848    ALLOCATE( drho_air_zw(nzb:nzt+1) )
    846849!
    847 !-- Density profile calculation for anelastic approximation
    848     t_surface = pt_surface * ( surface_pressure / 1000.0_wp )**( r_d / c_p )
    849     IF ( TRIM( approximation ) == 'anelastic' ) THEN
     850!-- Density profile calculation for anelastic and Boussinesq approximation
     851!-- In case of a Boussinesq approximation, a constant density is calculated
     852!-- mainly for output purposes. This density do not need to be considered
     853!-- in the model's system of equations.
     854!    t_surface = pt_surface * ( surface_pressure / 1000.0_wp )**( r_d / c_p )
     855    IF ( TRIM( approximation ) == 'anelastic' )  THEN
    850856       DO  k = nzb, nzt+1
    851           p_hydrostatic(k)    = surface_pressure * 100.0_wp *                  &
    852                                 ( 1 - ( g * zu(k) ) / ( c_p * t_surface )      &
    853                                 )**( c_p / r_d )
    854           rho_air(k)          = ( p_hydrostatic(k) *                           &
    855                                   ( 100000.0_wp / p_hydrostatic(k)             &
    856                                   )**( r_d / c_p )                             &
    857                                 ) / ( r_d * pt_init(k) )
     857          p_hydrostatic(k) = barometric_formula(zu(k), pt_surface *            &
     858                             exner_function(surface_pressure * 100.0_wp),      &
     859                             surface_pressure * 100.0_wp)
     860         
     861          rho_air(k) = ideal_gas_law_rho_pt(p_hydrostatic(k), pt_init(k))
    858862       ENDDO
     863       
    859864       DO  k = nzb, nzt
    860865          rho_air_zw(k) = 0.5_wp * ( rho_air(k) + rho_air(k+1) )
    861866       ENDDO
     867       
    862868       rho_air_zw(nzt+1)  = rho_air_zw(nzt)                                    &
    863869                            + 2.0_wp * ( rho_air(nzt+1) - rho_air_zw(nzt)  )
     870                           
    864871    ELSE
    865872       DO  k = nzb, nzt+1
    866           p_hydrostatic(k)    = surface_pressure * 100.0_wp *                  &
    867                                 ( 1 - ( g * zu(nzb) ) / ( c_p * t_surface )    &
    868                                 )**( c_p / r_d )
    869           rho_air(k)          = ( p_hydrostatic(k) *                           &
    870                                   ( 100000.0_wp / p_hydrostatic(k)             &
    871                                   )**( r_d / c_p )                             &
    872                                 ) / ( r_d * pt_init(nzb) )
     873          p_hydrostatic(k) = barometric_formula(zu(nzb), pt_surface *          &
     874                             exner_function(surface_pressure * 100.0_wp),      &
     875                             surface_pressure * 100.0_wp)
     876
     877          rho_air(k) = ideal_gas_law_rho_pt(p_hydrostatic(k), pt_init(nzb))
    873878       ENDDO
     879       
    874880       DO  k = nzb, nzt
    875881          rho_air_zw(k) = 0.5_wp * ( rho_air(k) + rho_air(k+1) )
    876882       ENDDO
     883       
    877884       rho_air_zw(nzt+1)  = rho_air_zw(nzt)                                    &
    878885                            + 2.0_wp * ( rho_air(nzt+1) - rho_air_zw(nzt)  )
     886                           
    879887    ENDIF
    880888!
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