<div dir="ltr"><div class="gmail_quote"><br><div><div><p><b><img alt="SDSU_CSRC Logo.jpg" width="534px" height="107px" src="cid:5ff85684-b649-46c5-862f-333387e39031"><br></b></p><p><b><br></b></p><p><b><font color="#ff0000" size="4"> </font></b><br><br><br><font size="4">DATE: <br><b>Friday, March 25, 2022</b></font></p><p><br></p><div dir="ltr"><p></p><p></p><p><font size="4">TITLE:<br><b>Consistent Continuum
Formulation and Robust Numerical Schemes for Isothermal/Non-isothermal
Multiphase Flows with Applications to Metal Additive Manufacturing/3D Printing
and Wave Energy Conversion</b></font> <b> </b> <b> </b> <b> </b> <b> </b> </p><div><br></div><p><font size="4">TIME: <br><b>3:30-4:30PM</b></font></p><p> <br></p><p><font size="4">LOCATION:<br><b>Viewing Party - GMCS 314</b><br><span style="font-weight:bold">or<br>Join Zoom Meeting - </span> <a href="https://sdsu.zoom.us/j/84471061245" target="_blank">https://SDSU.zoom.us/j/84471061245</a></font></p><p><br></p><p><font size="4">SPEAKER/BIO: <br><b>Amneet Bhalla, Mechanical Engineering, San Diego State University </b></font> <b> </b></p><p><br></p><p><font size="4">ABSTRACT:</font></p></div><div dir="ltr"><p><font size="4">A number of
manufacturing and energy conversion processes, such as metal 3D printing and
wave energy extraction, involve multiphase phenomena that vary widely in
thermo-physical properties among phases. These multiphysics processes involve
complex fluid-structure interactions, and some may also involve solidification,
melting, and evaporation. Due to several length and time scales, numerical
simulations of these multiphase problems can be challenging. In the first part
of the talk, we present a robust approach to modeling isothermal/non-isothermal
multiphase flows with solids, liquids, and gases that can change phases. A
discrete conservation of mass, momentum, and energy fluxes is employed to
enable robust numerical modeling of multiphase flows with high-contrasting
thermo-physical properties (density, viscosity, thermal conductivity). We
present several isothermal/non-isothermal benchmark examples to demonstrate the
robustness of the technique. <br>
<br>
The second part of the talk focuses on two contemporary problems in multiphase
flow engineering: (1) wave energy conversion (WEC) and (2) metal additive
manufacturing/3D printing. In particular, for WEC we present results for model
predictive control (MPC) integrated wave-structure interactions, where the MPC
controller finds the optimal energy-maximizing force "on the fly" by
dynamically interacting with the multiphase numerical wave tank (NWT). Our
results demonstrate that MPC is an adaptive controller that can adapt optimally
to changing sea conditions, and is therefore quite appropriate for controlling
wave energy converters. As an application of 3D metal printing, we present
simulations of air bubbles getting trapped in solidifying liquid metal, a
phenomenon known as the porosity defect in AM literature. Such high-fidelity
simulations provide vital insights into how heat and flow cause defects in
printed parts that tend to reduce their life expectancy. <br></font></p><p><font size="4">Bio: Dr. Amneet Bhalla obtained
his Ph.D. in Mechanical Engineering from Northwestern University in 2013 and
his Bachelors (2004-2008) and Masters (2009) in Mechanical Engineering from
Indian Institute of Technology at Kharagpur. He has postdoctoral training from
the University of North Carolina at Chapel Hill and Lawrence Berkeley National
Laboratory. He also has industrial experience at ExxonMobil Upstream Research
Company where he worked as a computational research engineer. In his research,
Dr. Bhalla develops numerical methods and high performance computing techniques
for computational fluid dynamics and computational fluid-structure interaction
problems. The broad goals of his research include developing mathematical
models for flow phenomena in engineering devices and processes, and to use
novel simulations to interrogate the underlying physics of the problem, with
the aim of improving and optimizing the engineering design. </font></p><p><br></p><p><font size="4">Host:<br><b>Parag Katira</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><br></div><div><br></div></div><div><div></div><div></div><br></div></div><div><br></div>
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