| | 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.
(since Feb. 2011) | | |  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
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) | | |  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) | | |  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) | | |  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) | | |  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)
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) | | |  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) | | |  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.
|
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).
| 2011-04-07 | | | 
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. |
|
| 2010-04-29 | | |
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. |
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