<div dir="auto">We were talking about related questions in Virtual Friam today.  Were you lurking?<br><br><div data-smartmail="gmail_signature">---<br>Frank C. Wimberly<br>140 Calle Ojo Feliz, <br>Santa Fe, NM 87505<br><br>505 670-9918<br>Santa Fe, NM</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 29, 2023, 5:26 PM Roger Critchlow <<a href="mailto:rec@elf.org">rec@elf.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I was going to post the University of Chicago press release, <a href="https://phys.org/news/2023-06-tempest-teacup-physicists-breakthrough-turbulence.html" target="_blank" rel="noreferrer">https://phys.org/news/2023-06-tempest-teacup-physicists-breakthrough-turbulence.html</a>, but let it slide until this other article turned up, <a href="https://phys.org/news/2023-06-approach-properties-turbulence.html" target="_blank" rel="noreferrer">https://phys.org/news/2023-06-approach-properties-turbulence.html</a>, the original report is paywalled at <a href="https://www.nature.com/articles/s41567-023-02052-0" target="_blank" rel="noreferrer">https://www.nature.com/articles/s41567-023-02052-0</a> with a paywalled editorial comment <a href="https://www.nature.com/articles/s41567-023-02054-y" target="_blank" rel="noreferrer">https://www.nature.com/articles/s41567-023-02054-y</a>.  <div><br></div><div>Oh, and there's also <a href="https://arxiv.org/abs/2211.00771" target="_blank" rel="noreferrer">https://arxiv.org/abs/2211.00771</a>.<div><br></div><div>So you put your fluid in a cubic reservoir with a vortex ring gun at each corner of the cube aimed at the center of the cube.  You can make free floating blobs of turbulence in the center of the reservoir by shooting combinations of vortex rings.  Vary the combinations of vortex rings and you vary the properties of the turbulent blob.  So for whatever varieties of turbulence you can synthesize and instrument, you now have an analog computer for finding properties and calibrating your digital simulations.</div></div><div><br></div><div>-- rec --</div></div>
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