63rd NIA CFD Seminar Webcast: High-Fidelity Simulations of Complex High-Speed Flows by Ali Uzun

August 26, 2015 - Leave a Response

63rd NIA CFD Seminar

Topic: High-Fidelity Simulations of Complex High-Speed Flows

Date: Tuesday, September 15, 2015

Time: 11:00am-noon (EST)

Room: NIA, Rm137

Speaker: Ali Uzun

Speaker Bio: Dr. Ali Uzun recently joined NIA as a Senior Research Scientist. He received his Ph.D. in Aeronautics & Astronautics from Purdue University in 2003. He joined the Florida State University as a post-doctoral research associate immediately after completing his Ph.D. and later became a Research Scientist at the Florida Center for Advanced Aero-Propulsion, Florida State University. His current research interests include computational fluid dynamics using high-order numerical methods, turbulence simulations, computational aeroacoustics and parallel computing.

Abstract: This talk will present sample applications of high-fidelity numerical simulations to complex problems that contain high-speed flow phenomena. Example applications include prediction of noise generated by high-speed free/impinging jets and detailed simulation of resonance-enhanced micro-actuators that generate pulsed high-momentum supersonic micro-jets for flow/noise control applications. A large eddy simulation (LES) methodology based on high-fidelity numerical schemes developed for turbulence simulations and computational aeroacoustics (CAA) has been utilized to perform the large-scale simulations. This talk will provide an overview of the numerical methods implemented in the simulation methodology and present representative results from the calculations. Comparisons with available experimental measurements will be made to assess the predictive capability of the simulations.

Additional information, including the webcast link, can be found at the NIA CFD Seminar website, which is temporarily located at

http://www.hiroakinishikawa.com/niacfds/index.html

 
niacfds_logo

TODAY: 61st NIA CFD Seminar Webcast: Third-Order Active Flux Schemes for Advection Diffusion by Hiro Nishikawa

August 25, 2015 - Leave a Response

61st NIA CFD Seminar

Topic: Third-Order Active Flux Schemes for Advection Diffusion

Date: Tuesday, August 25, 2015

Time: 11:00am-noon (EST)

Room: NIA, Rm137

Speaker: Hiro Nishikawa

Speaker Bio: Dr. Hiro Nishikawa is Associate Research Fellow, NIA. He earned Ph.D. in Aerospace Engineering and Scientific Computing at the University of Michigan in 2001. He then worked as a postdoctoral fellow at the University of Michigan on adaptive grid methods, local preconditioning methods, multigrid methods, rotated-hybrid Riemann solvers, high-order upwind and viscous schemes, etc., and joined NIA in 2007. His area of expertise is the algorithm development for CFD, focusing on hyperbolic methods for robust, efficient, highly accurate viscous discretization schemes.

Abstract: A miracle happens in CFD once again: A third-order active-flux diffusion scheme becomes, by itself, a third-order advection-diffusion scheme. This is possible by adding the advective term as a source term to the diffusion scheme. To solve the residual equations efficiently, Newton’s method is employed. For unsteady computations, it leads to a third-order implicit time-stepping scheme with Newton’s method. The resulting advection-diffusion scheme achieves third-order accuracy and the Newton solver converges very rapidly for both steady and unsteady problems.

Additional information, including the webcast link, can be found at the NIA CFD Seminar website, which is temporarily located at

http://www.hiroakinishikawa.com/niacfds/index.html

 
niacfds_logo

Follow

Get every new post delivered to your Inbox.

Join 451 other followers