[Faculty] Fwd: [CSRC.COLLOQUIUM] "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 "

[Jose Castillo]

*[image: SDSU_CSRC Logo.jpg]*





DATE:
*Friday, March 25, 2022*


TITLE:
*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*


TIME:
*3:30-4:30PM*



LOCATION:
*Viewing Party - GMCS 314*
or
Join Zoom Meeting -   https://SDSU.zoom.us/j/84471061245
<https://sdsu.zoom.us/j/84471061245>


SPEAKER/BIO:
*Amneet Bhalla, Mechanical Engineering, San Diego State University *


ABSTRACT:

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.

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.

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.


Host:
*Parag Katira*

Note: Videos of previous colloquium talks can be seen on the CSRC website
in the colloquium archive section or on the CSRC YouTube page here
<https://www.youtube.com/channel/UCN0ZEztlmyDqG2pm-Rle_Eg/feed>.




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