<div dir="ltr"><br><div class="gmail_quote"><br><div><div><p><img alt="SDSU_CSRC Logo.jpg" width="534px" height="107px" src="cid:ceaabeff-7924-431e-b91b-a633c8dd3a82"><br></p><p><br></p><p><font size="4">DATE: <br><b>Friday, March 11, 2022</b></font></p><p><br></p><div dir="ltr"><p></p><p></p><p><font size="4">TITLE:<br></font><b><font size="4">On the Physics and Simulation of Turbulent Flows</font> </b></p><p><b> </b></p><p><font size="4">TIME: <br><b>3:30-4:30PM</b></font></p><p> <br></p><p><font size="4">LOCATION:<br><b>In Person - GMCS 314</b><br><br></font></p><p><br></p><p><font size="4">SPEAKER/BIO: <br></font><b><font size="4">Perry Johnson, Mechanical and Aerospace Engineering, University of CA, Irvine </font> </b> <b> </b> <b> </b> <b> </b> <b> </b> <b> </b></p><p><br></p><p><font size="4">ABSTRACT:<br>The phenomenon of turbulence in fluid flows is a
paradigmatic nonlinear multiscale dynamical system in classical physics with
important implications for a wide range of natural and engineered flows. Brute
force simulations of many societally-relevant turbulent flows are far out of
reach even on today's world-class supercomputers, and this will remain the case
for the foreseeable future. As a result, turbulence modeling plays a central
role in advancing the state-of-the-art for computational fluid dynamics. A
promising, and increasingly popular approach to turbulence modeling is
Large-Eddy Simulation (LES). In LES, the large-scale turbulent fluctuations of
a given flow are directly resolved and approximate models are constructed to
represent the net effects of smaller-scale motions. One of the primary tasks of
LES sub-grid scale models is to remove kinetic energy from resolved scales in
an accurate manner. In this talk, I will review the scale-wise dynamics of
kinetic energy in turbulent flows as it relates to modeling and simulation. A
new perspective on the underlying theory of LES will be introduced, advancing
our fundamental understanding of turbulence physics and suggesting a new
framework for extending the effectiveness of LES to more complex flows.</font></p><p><br></p></div><div dir="ltr"><p><font size="4">Host:<br><b>Jose Castillo</b></font></p></div><div><font size="4"><br></font></div><div><p><font size="4"><span style="font-weight:bold">Note:</span><span style="font-weight:bold"> </span>Videos of previous colloquium talks can be seen on the CSRC website in the colloquium archive section or on the <a href="https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed" target="_blank">CSRC YouTube page here</a>.</font></p><p><br><br><br></p></div></div><br></div><div><br></div>
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