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Engineering Physics Colloquium

Thursday, March 15

3:45 PM to 5:00 PM

106 Engineering Research Building

Speaker:  Dr. Elia Merzari,  Argonne National Laboratory
"Three Dimensional Stability Analysis in Natural Convection Systems"
Abstract:  Fluid flows are subject to a wide range of instabilities. The study and prediction of such instability by the means of analytical and/or numerical methods is an active branch of fluid dynamics. The presence of an instability may have a severe impact on the performance or behavior of systems and components. In particular, the presence of such instabilities in natural convection systems may have a significant impact on the design and operation of passive systems or reactors designed to operate without pumps.
In the first part of this talk we will examine the classic one-dimensional stability theory of thermo-siphon loops (i.e., the prototype of natural circulation systems). In the second part of this talk we will examine methods to predict, quantify and influence a flow instability. The focus will be on the classic modal methods. In particular the attention will be on global linear stability analysis, where a general three-dimensional linear perturbation is superposed to the base flow field and the eignevalue-eigenfunction spectrum of the linear operator so determined, is computed.
Biography:  Dr. Elia Merzari currently works at Argonne National Lab at the Nuclear Engineering Division. His current research focuses on passive cooling methods for next generation nuclear reactors. Prior to joining Argonne, Elia was a Postdoctoral Fellow at the Tokyo Institute of Technology. He received his B.S. in Engineering of Energy Systems and his M.S. in Nuclear Engineering from Milan Polytechnic University in Italy and his Ph.D. in Nuclear Engineering from Tokyo Institute of Technology.
Contact: Darius Lisowski, 978-902-0771