BOMEX

Purpose

With this example trade wind cumulus convection under steady-state conditions can be studied.

Description

The setup is based on the ​GCSS LES intercomparison case ​BOMEX (​Siebesma et al. (2003)). It describes shallow cumulus convection in the trade wind region over the ocean. During the simulation cumulus clouds form. The cloud cover is about 0.2. Results from BOMEX simulations with PALM were published in Heinze et al. (2012) and Riechelmann et al (2012).

References

• Heinze, R., S. Raasch and D. Mironov, 2012: Budgets of scalar fluxes for cloudy boundary layers
  20th Symposium on Boundary Layers and Turbulence, Boston, MA, USA (talk) ​extended abstract
  
  
• Riechelmann, T., Y. Noh and S. Raasch, 2012: A new method for large-eddy simulations of clouds with Lagrangian droplets including the effects of turbulent collision. New J. Phys., 14, 065008, doi:​10.1088/1367-2630/14/6/065008
  

PALM version

r995

Required user code

Please find the user code attached​. Small adjustments are required in init_3d_model.f90 and prandtl_fluxes.f90 for the BOMEX case in addition to the user routines. They can also be found in the attachment and have to be placed in the same directory as the user routines.

Parameter files

Please find the parameter file attached​.

Model run

The basic command is

mrun -d bomex -r "d3# ts# pr# xy# 3d#" -X 32 -T 8 -t 1800

Please set other options, such as -h, -K, and -q according to your needs. Note that this example will require 8 processors for at least 10 minutes. If you want to carry out this job with less processors, please adjust the parameter file accordingly.

Monitoring

Please find the run control file attached​.

Postprocessing

The results of the simulation are in accordance with the results of other LES models which took originally part in the LES intercomparison. For a quantitative comparison, the LES data of the models is available ​here.