IEEE Visualization Contest 2011

Official event of the VisWeek 2011

Questions / Evaluation Criteria

Hint (updated on 11th July 2011)
The evaluation of all submissions will be performed by a team of renowned domain experts in the field of fluid dynamics and centrifugal pumps. The overall technical quality will additionally be rated by a team of visualization experts.

A stall is defined as a condition where the angle of attack increases beyond a certain point such that the lift begins to decrease. It is caused by the massive separation of the flow from the blade or wing at high angle of attack. It is characterized by the appearance of unsteady vortices on the suction side of the blade.
The stable operating range of pumps is limited by flow instabilities occcuring in deep part load. If the flow rate is reduced the flow onto leading edge is misaligned and stalls at a critical lower limit, similar to the stall of a wing at high angle of attack. Due to interaction of adjacent blade channels the stall rotates at constant rotational speed relative to the blading. The strong fluctuations of fluid flow properties during stall may lead to flow induced vibrations, which need to be avoided. The phenomenon is strongly influenced by turbulence, so turbulence modelling is of vital importance for the simulation of such a flow.

In the blade rows of a turbomachine, such as a pump, the stall is influenced by adjacent blades, which forces the stall to travel at a specific rotational speed relative to the blade (hence "rotating stall").

The overall goal is to visualize the instability of the
flow and help understand the movement and development of rotating stall cells based on 3 different turbulence models. The goal is to find a visualization such that researchers can easily gain insights as to where these vortices develop, how the stall moves and, possibly, why they develop.

Further hints! (new 21.03.2011)

  • Your task is to come up with a good, intuitive and efficient visualization of the movement of vortical structures in the flow field.

  • The structures could be defined by the lambda_2 criterion or the Q-criterion, but these are not necessarily the best options.

  • The focus is primarily on visualization of the movement of large structures, but smaller ones are welcome, too.

  • Of special interest would be a tracking of the highly unsteady vortical structures, since a periodic appearance of vortices is identified from Fourier analysis of the flow field from absolute frame of reference (fixed to the stator).

The IEEE Vis Contest motivation is to spur innovation in visualization techniques used in analysis of fluid dynamics data. The submissions are encouraged to demonstrate their novel methods which allows scientists to understand the underlying processes of fluid dynamics and enable them to answer the questions posed by the contest through the use of visualization. Demonstration of interactiveness in the application is not required, but encouraged.

Early Registration

September 16th, 2011


September, 9th, 2011


July, 31st, 2011,
23:59 PST


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