The SemSeg User Forum


User Forum  


Below, we list all partners that have joined the SemSeg User Forum.  We list them in chronological order.   Further below, we comment on project activities that are related to the SemSeg User Forum. 

SemSeg User Forum partners

(since Feb. 2011)


SimVis GmbH (SimVis)

SimVis has been founded in early 2008. It represents more than ten years of profound and successful visualization research as well as visualization software development. The main goal of SimVis is the development of the commercial visualization system SimVis, as well as consulting and customized R&D in visual interactive analysis of large and complex simulation and/or measurement data. 

(since Feb. 2011)


AVL List GmbH (AVL)

AVL is the world's largest privately owned and independent company for the development of powertrain systems with internal combustion engines as well as instrumentation and test systems. AVL is acting in the following scopes of business: (1) Development of Powertrain Systems. (2) Simulation. (3) Engine Instrumentation and Test Systems. 

(since Jan. 2010)


Nansen Environmental and Remote Sensing Center (NERSC)

The Nansen Environmental and Remote Sensing Center (NERSC) is an independent non-profit research institute in Bergen, Norway.  It conducts basic and applied environmental research funded by national and international governmental agencies, research councils and industry. 

(since Jan. 2010)


Lab of Fluid Dynamics & Technical Flows (LSS)

The Laboratory of Fluid Dynamics and Technical Flows (LSS) (at the Univ. of Magdeburg, Germany) is responsible for all research and teaching activities in the field of fluid dynamics.  This includes in particular experimental and numerical research projects concerning reacting and multi-phase flows, sprays, laminar and turbulent flames, turbomachines and pumps, flow instabilities, non-Newtonian flows, mixing improvement, optimization of flow conditions, hydraulic transport, medical flows, ... 

(since Feb. 2010)


AFC Air Flow Consulting AG (AFC)

With more than 20 years of experience, the AFC Air Flow Consulting AG (AFC) is known as a pioneer in numerical simulation for the built environment (CAE) and computational fluid dynamics (CFD).  Simulation methods are applied in the most efficient way.  Another strength of AFC is the total problem analysis approach.  Projects are pursued from the problem analysis to the implementation, eliminating a number of risks for the customer. 

(since Feb. 2010)


Forsvarets Forskningsinstitutt (FFI)

The Forsvarets Forskningsinstitutt (FFI) is a research institute conducting research for the Norwegian defense, but also for the civil society and industry.  Our contact at FFI is in charge of a group of physicists and mathematicians doing numerical and experimental studies of fluid flows and gas related problems such as waves, turbulence, turbulent flows, transport of aerosols, etc. 

(since June 2010)


Andritz VATech HYDRO (Andritz)

Andritz VATech HYDRO (Andritz) is a worldwide manufacturer of hydraulic turbines.  One of its research and development departments (in Vevey, Switzerland) is in charge of the hydraulic development of Pelton turbines.  With respect to numerical simulation, it has a worldwide recognition for CFD developments on multiphase flows.  Atop expertise in Eularian methods the interest in meshless Smooth Particle Hydrodynamics (SPH) was identified recently, generating advanced research activities. 

(since June 2010)


Geophysical Institute (GFI)

The Geophysical Institute (GFI) (at the Univ. of Bergen, Norway) works with storms, ocean currents, raindrops, avalanches, heat waves and CO2 exchange. At GFI the driving forces of nature are explored. The GFI is an internationally acknowledged contributor to the development of marine research and weather forecasting methods, including the Bergen School of Meteorology. 

(since Oct. 2010)


German Aerospace Center (DLR)

The German Aerospace Center (DLR) is Germany's national research center for aeronautics and space. Its extensive research and development work in aeronautics, space, transportation and energy is integrated into national and international cooperative ventures. As Germany's Space Agency, the German federal government has given DLR responsibility for the forward planning and implementation of the German space programme as well as international representation of Germany's interests. 

Activities of the SemSeg User Forum

The members of the SemSeg User Forum engage in the project research by supplying related problem scenarios (and the according data).  One of the first activities of the SemSeg User Forum is a workshop in April 2010 (in Vienna, Austria).  The next major activity in relation to the User Forum is another workshop (colocated with the TopoInVis 2011 conference in Zürich, Switzerland).  In 2012, a 3rd workshop of the SemSeg project is held in Magdeburg, Germany. 



3rd SemSeg User Forum workshop in Magdeburg, Germany

During the 3rd SemSeg User Forum workshop in Magdeburg, Germany, again four cases are presented.  The program of this workshop is available from the University of Magdeburg and their home page. 

Tidal Flow
(Uni Computing Bergen case study)
Gas Leakage
(GexCon case study)
Ronny Peikert from ETH Zürich presented a new case study around the revolving door (AFC case) as well as another new case study around marine tidal flow (simulation data from Uni Computing at the Univ. of Bergen, Norway) in which he studied in which degree repelling and attracting Lagrangian coherent structures are capable to capture the major tidal flow patterns. Armin Pobitzer from the Univ. of Bergen presented a study of the air flow in a closed room (no an offshore platform) in conjunction with a gas leakage in this room and the temporal development of the distribution of the gas in this room.  To study this scenario the movement of the air in this room had to be studied.
Centrifugal Pump
(VRVis case study)
Blood Flow
(UMAG case study)
Alan Lež from VRVis presented the interactive visual analysis of the flow through a centrifugal pump (the IEEE VisContest dataset).  Different questions were investigated, including the analysis of particles which ''move the wrong way'', particles which move very slowly, and how the flow leaves the pump. Alexander Kuhn and Mathias Otto from the Univ. of Magdeburg presented a study of blood flow (based on simulation data from LSS).  Both scalar fields were studied as well as a Lagrangian analysis performed (with streamlines and also with FTLE and pathline attributes).



2nd SemSeg User Forum workshop in Zürich, Switzerland

During the 2nd SemSeg User Forum workshop in Zürich, Switzerland, three cases from three forum partners were studied (in addition to a presentation of their visualization software by forum partner SimVis):

Analyzing a Revolving Door
(AFC case study)
Studying Cyclonice Separation
(DLR case study)
Benjamin Schindler from ETH Zürich presented a visual analysis of air flow as generated at building entrances, based on a combination of techniques, in particular also including Lagrangian coherent structures (LCS). Air flow simulation through a revolving door with an air curtain as provided by AFC was studied. LCS, which by definition are flow barriers, were the method of choice for visualizing the separation and recirculation behavior of warm and cold air flow. The extraction of LCS is based on the finite-time Lyapunov exponent (FTLE) and makes use of a ridge definition which is consistent with the new concept of weak LCS. Alexander Kuhn from Univ. of Magdeburg presented a case study based on the data from a hydrocyclone simulation as provided by DLR. An analysis of the separation properties of the machine was performed. The study included a comparison of different time parameters as needed for the extraction of FTLE values from the simulation data. This analysis was compared to the use of other state of the art techniques that are useful to investigate separation behavior.
Pathline Analysis of Weather Data
(GFI case study)
The SimVis System
(SimVis presentation)
Armin Pobitzer from the Univ. of Bergen presented a case study on weather data, consisting of particle trajectories and as provided by GFI. The particles represent air portions and their transport in the atmosphere. The data describe the air and moisture transport into the area of Ethiopia in August 1998. The aim was to single out main air transport "branches" and investigate their contribution to the area in terms of moisture. Helmut Doleisch and Philipp Muigg from SimVis GmbH in Vienna presented the visual analysis system SimVis.



1st SemSeg User Forum workshop in Vienna, Austria

During the 1st SemSeg User Forum workshop in Vienna, Austria, four cases from four forum partners were studied:

Study of FTLE ridges
(Andritz Hydro case study)
Blood flow through an aneurysm
(UMAG case study)
Ronald Peikert and Raphael Fuchs from ETH Zürich presented a study of ridge extraction from FTLE (finite-time Lyapunov exponents) data. Data from a simulation of water flow through the support of a Pelton turbine was compared to a simulation of a breaking dam. Different ridge definitions were compared, including the new concept of a C-ridge. Alexander Kuhn and Gabor Janiga from Univ. of Magdeburg presented a study of blood flow through an aneurysm. Patient-based data was compared to a synthetic dataset. The aneurysms are characterized by an extraordinary flow behavior compared to the surrounding vascular structures. We have seen how a very high-order vortex core extraction can help in understandig such data.
Channel flow analysis
(FFI case study)
Study of an Exhaust Manifold
(AVL case study)
Armin Pobitzer from the Univ. of Bergen presented the interactive multi-detector analysis of features within vortical flow. Vorticity magnitude, lambda2, Hunt's Q, swirling strength, helicity, the Sujudi-Haimes methods and a modification of Sujudi-Haimes for unsteady flow were used in the analysis. Results were discussed for a turbulent channel flow from FFI.Krešimir Matković from the VRVis in Vienna presented a pathline-based analysis of the flow through an Exhaut Manifold as provided by AVL. It was shown how interactive visual analysis, especially the pathline attributes analysis, can help engineers in understanding exhaust manifold characteristics.