Numerical models 
Meteorological mesoscale models Sound propagation models REWISYS postprocessing and plotting Links

Meteorological mesoscale models (click model name for references and further details)

The models REWIH3D, FITNAH and FLU3D are operated at DLR for modelling the atmosphere in the context of regional climate research, mesoscale meteorology, and sound propagation.
The models REWISIM and REWIMET are no longer used at DLR.
developped at Free University of Berlin University of Munich DLR Techn. University of Darmstadt DLR
developped by D.Heimann D.Heimann  D.Heimann G. Groß D.Heimann
space scale meso-b meso-b meso-a , meso-b meso-g, (micro-a) micro-b
typical horizontal resolution 4 - 10 km 4 - 10 km 4 - 100 km (2 m) 200 m - 2 km 0.1 - 2 m
typical vertical resolution none 50 m near ground 20 m near ground 2 m near ground 0.1 - 2 m
nesting no no yes (multiple) no no
time-dependent external forcing no no supra-scale analyses of
model results
supra-scale analyses of
model results
design diagnostic prognostic prognostic prognostic diagnostic
dynamics hydrostatic hydrostatic hydrostatic non-hydrostatic compressible, adiabatic
geometry 2D - 1-level model  3D - 3-layer model 3D - multi-level model 3D - multi-level model 2D / 3D
vertical coordinate terrain-following level lowest layer terrain following transformed transformed regular
orography yes yes yes yes yes
obstacles (e.g. buildings) via roughness via roughness via roughness parameterized yes
canopy (e.g. trees) via roughness via roughness via roughness parameterized no
turbulence parameterized - resistence parameterized - resistence parameterized - TKE parameterized - TKE parameterized - TKE
soil model no no yes - force-restore or multi-layer yes - multi-layer no
radiation fluxes no no yes - shortwave / longwave yes - shortwave / longwave no
clouds and precipitation no no yes (liquid and solid) no no
deep convection no no parameterized no no
transport of tracers no yes - Euler yes - Euler via subsequent simulation not implemented yet
REWISYS interface
for plotting and post-processing
yes - type 1 yes - type 1, 4 yes - type 1, 3, 4 yes - type 1, 3, 4 yes - type 1, 3
remarks non-linear version of AKU3D

Sound propagation models
developped at DLR DLR
developped by D.Heimann D.Heimann, R.Blumrich
range 100 m - 5 km 10 m - 500 m
design Lagrange (ray based) - linear dynamics Euler (grid based) - linear dynamics
dimension 2D / 3D 2D / 3D
terrain yes - smooth yes - steps
obstacles yes - random or explicitly specified yes - explicitly specified
grid terrain following regular
inhomogeneous ground yes - complex impedence yes - real impedence or explicit 'porosity'
inhomogeneous meteorology yes - wind (u, v, w), temperature, humidity, TKE yes - wind (u, v, w), density, humidity
source 2D: line source, 3D: point source 2D: line source, 3D: point source
directivity of source yes no (uniform radiation)
frequency range 100 - 5000 Hz 10 - 500 Hz
Multi-frequency noise yes restricted
refraction by temperature gradients yes yes
refraction by wind gradients yes yes
refraction by wind and temperature gradients in combination yes yes
scattering by turbulence  parameterized planned
absorption parameterized parameterized (single frequency only)
defraction (into shadows) parameterized yes
data input from meteo model FITNAH FITNAH, FLU3D
REWISYS interface
for plotting and post-processing
yes - type 2 yes - type 1, 2, 3
remarks linear version of FLU3D with
prescribed meteorological parameters


REWISYS is the common system of standard file types used for post-processing and plotting.

R3DPP, F3DPP and A3DPP are post-processors for REWIH3D, FITNAH/ASMUS-F and AKU3D, respectively. These programmes read the 3D output of the simulation models [Type 3] for different time slices and extract selected 2D fields (horizontal fields on model levels / parallel to sea level / parallel to the terrain [Type 1] and vertical cross-sections along x-axis/y- axis/oblique [Type 2]).

REWIplot is an IDL-based software package for the visualization of 3D model output.

Selected links to meso-scale atmospheric modelling groups
NCAR - Mesoscale and Microscale Meteorology Division
Colorado State University - Regional Atmospheric Modeling System RAMS

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 Last modified 23 October 2000