东南大学数学学院邀请专家申请表
报告人 | M. Muthtamilselvan | 单位 | Department of Mathematics, Bharathiar University |
报告题目 | Nanofluid in a lid-driven cavity with uniform and non-uniform heating of bottom wall
| ||
报告时间 | 2018/12/19 15:00-16:00 | 地点 | 数学学院第一报告厅 |
邀请人 | |||
报告摘要 | Steady state two-dimensional mixed convection in a lid-driven square cavity filled with Cu–water nanofluid is investigated numerically in the presence of internal heat generation. In the present investigation, bottom wall is uniformly and non-uniformly heated while two vertical walls are fixed and they are thermally insulated. The top wall is moving from left to right at a constant speed. The governing equations are normalized and solved numerically with boundary conditions by finite volume approach using third order accurate upwinding scheme (deferred QUICK). Effects of the pertinent physical parameters are investigated in terms of the flow and temperature fields, as well as Nusselt number distributions. The presented results show that the solid volume fraction plays a significant role on the flow and thermal fields and the Nusselt number distributions for different flow configurations. It is found that Richardson number strongly affect the fluid flow and heat transfer in the cavity. For Ri < 1, the forced convection becomes dominant in the entire cavity, the natural convection relatively weak. | ||
报告人简介 | M. Muthtamilselvan received his Ph.D. in 2008 from the Department of Mathematics, Bharathiar University, India. He is currently professor at the Department of Mathematics, Bharathiar University. His research interests are Computational Fluid Dynamics (CFD), convection in nanofluids, boundary layer flow and heat transfer analysis. He has published more than 45 articles in International reputed journals. He has completed 2 major research projects funded by Govt. of India. He guided 4 Ph.D and 27 M.Phil. students in the area of Applied Mathematics. He has reviewed more than 100 papers in International journals like, Heat and Mass Transfer, International Journal for Numerical Methods in Fluids, IMA Journal of Applied Mathematics,ASME Journal ofComputational and Nonlinear Dynamics, Journal of Mechanics, Engineering Applications of Computational Fluid Mechanics, etc. | ||
报告人 | R. Rakkiyappan | 单位 | Department of Mathematics, Bharathiar University |
报告题目 | Adaptive fractional fuzzy integral sliding mode control for PMSM model
| ||
报告时间 | 2018/12/19 14:00-15:00 | 地点 | 数学学院第一报告厅 |
邀请人 | 曹进德 | ||
报告摘要 | This presentation aims to address the stabilization problem of permanent magnet synchronous motor (PMSM) based wind energy conversion system (WECS) through a novel adaptive fractional fuzzy integral sliding mode control (FFISMC) scheme in contrast to the traditional integer order control schemes. The main objective of modeling the fractional order control for nonlinear PMSM is to enhance the convergence rate which is effectively better when compared to integer order control schemes.
In addition, the paper intensively investigates the performance of fractional order controllers in both PMSM and surface-mounted PMSM-based WECS through analyzing the global stability of closed-loop system based on Lyapunov stability theory. In this regard, firstly, the nonlinear PMSM model is transformed into equivalent linear sub-models through an effective Takagi-Sugeno (T-S) fuzzy membership rules. Then, a novel automated (adaptive) controller is designed along with fractional sliding surface which involves an integral term to control the considered PMSM. In general, adaptive controllers are much more effective than manual controllers. Further, the sufficient conditions are derived in terms of linear matrix inequalities (LMIs) via constructing the novel fractional fuzzy Lyapunov functional with quadratic terms, which guarantees the global stabilization of PMSM-based WECS. Overall performance and effectiveness of the proposed theoretical results are demonstrated through numerical simulations. | ||
报告人简介 |
| ||
