Fax: +49 228 525 229
Phone: +49 228 525 291
ALMA Pipeline Heuristics
- Object Oriented Programming and Design lectures (AIfA, MPIfR, HBRS).
I am interested in the physical causes of
the clumpy and filamentary structure of interstellar
clouds. To simulate interstellar hydrodynamics
I have written a parallelized 3D Lattice Boltzmann (LB) code.
The simulations of turbulent flows show that distinct structure
occurs only at Reynolds numbers between 500 and 5000, i.e. at
the transition between laminar and fully turbulent flow.
This is the first astrophysical application of the
Lattice Boltzmann method.
I have created some animated GIFs and FLI/FLC animations of volume
rendered results of my 3D numerical simulations.
Click on the animated GIF to get a larger FLC movie of this
Lattice Boltzmann simulation:
This example shows the
development of distinct
filaments and clumps at
the transition between
laminar and turbulent
flow regimes (Re=1500,
1 MB FLC File
The LB code runs on the massively parallel mainframe
Connection Machine 5 (CM-5), on the IBM SP-2 parallel
supercomputer and on clusters of workstations using
Parallel Virtual Machine (PVM) as message passing library and
ADAPTOR as High Performance Fortran translator. I have also ported my Lattice
Boltzmann code to the 34 node IBM SP-2 parallel supercomputer at the
GMD Forschungszentrum Informationstechnik GmbH.
To compare the simulations with radio data, I have observed the quiescent
dark cloud Lynds 1512 with the
100m telescope at Effelsberg. For the first time ``On-The-Fly''
and Frequency Switching techniques have been used together
to obtain a large map of sulphur monoxide emission at 30 GHz.
You can read the abstract of my
Ph.D. thesis about ``Three-Dimensional
Parallel Lattice Boltzmann Hydrodynamic Simulations of Turbulent
Flows in Interstellar Dark Clouds''
or retrieve the full text g-zipped (3.25 MB)
PostScript file including 15 color figures.
There is also a searchable
g-zipped PDF version of the thesis.
After getting my PhD in 1995 I was a research assistant in the
Millimeter and Submillimeter Astronomy Group
at the MPIfR.
I worked on improving the acousto-optical
spectrometers for the SMTO
(Submillimeter Telescope Observatory).
From October 1996 to December 1999 I was one of the staff astronomers at the
SMTO. During this time
I worked on improving the telescope control and spectral line
calibration software. I implemented new observing modes such as "On-The-Fly"
Mapping and "Line Pointing" and I ported the calibration software to Linux.
In January 2000 I joined the MPIfR
to work on High-Level Software Analysis & Design issues for the
ALMA (Atacama Large Millimeter
Array project, a millimeter/submillimeter interferometer
in the Atacama desert consisting of 66 antennas.
I am now the head of the
APEX (Atacama Pathfinder EXperiment)
software development group and since
September 2003 I am the head of the
ALMA Pipeline Heuristics group.
Last Modified: June 21, 2021,