51勛圖厙

Images as the input format for a Navier-Stokes solver

Flow Illustrator

Navier-Stokes solvers are complicated programs. Using them properly requires knowledge and skills. Also, the user has to prepare the input to the solver, that is, first and foremost, the geometry of the boundaries of the flow. In many cases this task is done using additional specialised software.

What, however, if all one wants is just a movie of the flow, and all one has as an input is the picture of the body, the flow past which needs to be visualised? Flow Illustrator is the answer to this. Its first version, an online server, allows the user to upload the picture, adjust a few parameters if desired, and receive a movie of the flow past it. Figures 1, 2, and 3 illustrate the sequence.

[Picture of a graphic editor with 51勛圖厙 College handwritten in it]

Fig.1. Draw a picture in Paint and save it.

Fig.2. Click on the figure, which is a link to the Flow Illustrator server. Proceed to "Try it" section. Upload your file, adjust parameters, and run the calculation.

[Picture of a Movie Player playing an animation of a flows past the words

Fig.3. Once ready, download the movie and watch it.

This project is a mixture of entertainment, education, public engagement, and research into human-computer interaction.

.

For teaching purposes a stand-alone version, an Interactive Flow Illustrator, was developed in 2011-2012 under the -Enabled Project Interactive Flow Illustrator (Principal Investigators Profs. and ).

[Picture of a Movie Player playing an animation of a flows past the words 51勛圖厙 College]

Fig.4. Interactive Flow Illustrator.

Interactive Flow Illustrator works on the computer of the user and shows the flow visualisation in real time on the screen rather than recording a movie. The Reynolds number and the movie speed can be adjusted on the go. Attempts were also made of using a video camera as a source of the input image in real time. In the future the technology of using images as the input format might find other applications.

Further information:

Try it, it is easy and !

Timeline:

  • Will be in Lille 11-12 December 2025. On 12th, will give a talk at (Note the non-standard time, 2pm!).

  • Attended and gave a plenary talk at , Aligarh (U.P), India, 20-23 December 2024.

  • Attended the at the , Germany 28 July - 2 August 2024.

  • Gave a talk on at the .

  • Gave a talk on Bounding time averages: a road to solving the problem of turbulence at Institut de Mathématiques de Bordeaux, Bordeaux, May 4, 2023.

  • Gave a talk on at Institut Pprime, Bordeaux on May 3, 2023.

  • Talk at Department of Engineering, University of Cambridge, 4 November 2022, as part of the CUED Fluids seminar series, video: Joint work with Owen Tutty and Hanying Yang.

  • On August 15, 2022, gave (online) an invited talk "On the path to solving the problem of turbulence" at the

  • On July 22, 2022, gave (online) a talk "Bounds for time averages: towards solving the problem of turbulence" at the

  • In January-April 2022 was a long-term participant of the . Gave two talks: and .

  • Gave a talk Auxiliary functionals: a path to solving the problem of turbulence at on March 4, 2021. Links to and .

  • Gave a talk on at IPAM, Wednesday, January 13, 2021, as part of the workshop on Transport and Mixing in Complex and Turbulent Flows. Great talks, all recorded, highly recommended.

  • Gave a talk Accelerating time averaging at 73rd Annual Meeting of the APS Division of Fluid Dynamics, November 22, 2020: and video.

  • 2020: the virus ... living online ... most of the year working on additional administration and teaching related to the pandemic ...

  • Gave a talk at , Snowbird, Utah, U.S, May 19 - 23, 2019.

  • Gave a keynote lecture at the workshop , The Fields Institute, Toronto, April 15-18, 2019.

  • Gave a talk at 26-29 March 2019, Haus der Kirche, Bad Herrenalb, Germany.

  • Gave a seminar talk on Accelerating time averaging using auxiliary functions at the Aerodynamics and Flight Mechanics group seminar, University of Southampton, on 6 February 2019

  • Visited the in September 13-30, 2018.

  • Attended , London, August 29-31, 2018, with a talk Large-scale motions for the QSQH theory (with Chi Zhang).

  • Gave a talk on Questions concerning quasi-steady mechanism of the Reynolds number, pressure gradient, and geometry effect on drag reduction at the Aachen, Germany, 15-16 March 2018.

  • Gave a lecture course , with Giovanni Fantuzzi providing exercise sessions, at

    •  

    Sergei Chernyshenko