Changeset 4079 for palm/trunk/SOURCE/modules.f90

Timestamp:

Jul 9, 2019 6:04:41 PM (5 years ago)

Author:

suehring

Message:

Implementation of a monotonic flux limiter for vertical advection term in Wicker-Skamarock scheme. The flux limiter is currently only applied for passive scalars (passive scalar, chemical species, aerosols) within the region up to the highest topography, in order to avoid the built-up of large concentrations within poorly resolved cavities in urban environments. To enable the limiter monotonic_limiter_z = .T. must be set. Note, the limiter is currently only implemented for the cache-optimized version of advec_ws. Further changes in offline nesting: Set boundary condition for w at nzt+1 at all lateral boundaries (even though these won't enter the numerical solution), in order to avoid high vertical velocities in the run-control file which might built-up due to the mass-conservation; bugfix in offline nesting for chemical species

File:

• palm/trunk/SOURCE/modules.f90 (modified) (2 diffs)

palm/trunk/SOURCE/modules.f90

@@ -25 +25 @@
 ! -----------------
 ! $Id$
+! + monotonic_limiter_z
+! 
+! 4069 2019-07-01 14:05:51Z Giersch
 ! Masked output running index mid has been introduced as a local variable to 
 ! avoid runtime error (Loop variable has been modified) in time_integration
@@ -1360 +1363 @@
     LOGICAL ::  masking_method = .FALSE.                         !< namelist parameter
     LOGICAL ::  mg_switch_to_pe0 = .FALSE.                       !< internal multigrid switch for steering the ghost point exchange in case that data has been collected on PE0
+    LOGICAL ::  monotonic_limiter_z = .FALSE.                    !< use monotonic flux limiter for vertical scalar advection
     LOGICAL ::  nesting_offline = .FALSE.                        !< flag controlling offline nesting in COSMO model  
     LOGICAL ::  neutral = .FALSE.                                !< namelist parameter