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Project PRESTIGE: In-situ visualization of flow processes in very large CFD calculation models

Jet engine © -jkb- Lizenz: CC BY-SA 3.0

As part of the aviation research programme of the Federal Ministry of Economics and Energy (BMWi)the joint project PRESTIGE was launched in 2018. This project brings together partners from academic research and industry and is dedicated to the further development and validation of simulation methods to improve the interdisciplinary understanding of engine systems.
One goal of the project is the numerical simulation of a transient flow through a complete engine compressor including its stationary and rotating components. In order to be able to compare the numerical investigation results with existing practical or experimental experience, a correspondingly fine grid resolution of the volume including all individual components is required. This leads to computational grids with several billion grid nodes, which can only be processed on supercomputers.
Due to the unsteady effects within the engine system, a time-dependent investigation of the processes is necessary. This generates immense amounts of backup and evaluation files, the handling of which (read and write accesses, memory requirements) is associated with high time and cost-intensive expenditure. Possibilities to significantly reduce this effort by direct processing and evaluation during the running process (“in-situ”) is part of the research work within the PRESTIGE project. In-situ visualization enables the user to extract and process results directly from the memory of the process already during the running CFD simulation
More powerful hardware and software enables ever more complex and realistic calculation models, so that in-situ evaluations will gain immensely in importance in the future.

CFD Consultants GmbH, as an industrial partner in cooperation with Intelligent Light, a leading company in the field of CFD post-processing, has made a significant contribution to the joint project and was able to develop an in-situ visualization solution and successfully implement it in a CFD code.

Pressure contours in a jet engine

This solution is not only suitable for large-scale projects, but is also interesting for all other fluidic simulation projects, especially for time-dependent investigations. This makes the method attractive for everyone who is involved in numerical flow simulation.

Contact: Birgit Hanna, CFD Consultants GmbH

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“Freezing” instruments due to new acoustics?

Anyone who has ever attended a concert – whether symphony or rock concert – has experienced that this is a pleasure for (almost) all our senses. For an unforgettable experience, no, you have to be able to feel, see and above all hear the music.

This is especially true for the musicians themselves, who present their art on stage. In order to be able to bring these to the fore, however, the musician must be able to hear his comrades-in-arms himself, in order to be able to time the performances correctly, to be able to adjust the volume precisely.

In the Deutsche Staatsphilharmonie Rheinland-Pfalz (Ludwigshafen) the rehearsal hall is currently being renovated. The aim is to improve the acoustics for the musicians – and of course also for the listeners – in order to make listening an experience for everyone.

The new acoustic concept not only sets the tone in terms of acoustics, but also has an effect on all other trades – especially ventilation technology. The specifications developed provide for ventilation of the rehearsal room exclusively from below.

This means that the air supply must also take place in the area of the musicians and thus of the parked instruments. For the “clean” sound of the instrument, temperature fluctuations should be kept as low as possible. If this is not the case, the first notes of the musical instrument may sometimes sound “wrong”.

In order to rule this out, the ventilation system may only be operated in a narrow temperature range, which leads to the question of whether the resulting room climate is perceived by all – musicians and spectators – as pleasant and conducive to music enjoyment.

Since the question cannot be clarified with the help of experiments, during the planning phase the test room was examined with the help of numerical flow simulation (CFD) and the ventilation concept was checked or adapted according to the results obtained. Thus, the ventilation concept can be implemented in the current reconstruction phase.

The investigations carried out show that the musical instruments do not have to “freeze” and that there is nothing to prevent the enjoyment of the music played from this side.

Beat Fehlmann, director of the Staatsphilharmonie Rheinland-Pfalz, welcomed the new acoustic concept in an interview with SWR: “I have great hopes that we will create a workplace that will make it possible to improve quality. The overall sound of the orchestra, the interplay, the precision, the fine tuning among each other. That when something doesn’t work it is exaggerated to say one’s own inadequacy and not some factor you can’t influence. The listeners can hear the orchestra as a whole better, including the individual voices. And that makes the concert experience even more lively.”

More on this topic:

Radio original soundtrack: Mittagsmagazin SWR4 Rheinland-Pfalz (Radio, MP3)
Article: SWR Aktuell

Contact: Heiko Tebben, CFD Consultants GmbH