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4th CSI/IEEE International Symposium on VLSI Design, VLSI 1991

作者： Mall, R. Patnaik, L.M. Raman, S. Dept. of Computer Science and Automation Microprocessor Applications Laboratory Supercomputer Education and Research Centre Indian Institute of Science Bangalore560012 India Dept. of Electrical and Computer Engineering Coordinated Science Laboratory University of Illinois Urbana-ChampaignIL61801 United States

ISBN: (纸本)0818621257

Many times, routing of signal nets in the layout design of VLSI circuits turns out to be a bottleneck in designing complex chips, due to the inherent compute-intensive nature of this task. Parallel processing of the routing problem holds promise for mitigating this situation. The authors present a parallel channel routing algorithm that is targetted to run on loosely coupled computers like hypercubes. The proposed parallel algorithm employs simulated annealing technique for achieving near-optimum solutions. For efficient execution, attempts have been made to reduce the communication overheads by restricting broadcast of updates only to cases of interprocessor net transfers. Performance evaluation studies on the algorithm show promising results. © 1991 IEEE.

关键词： Simulated annealing

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Simulated annealing-based channel routing on hypercube computers

Simulated annealing-based channel routing on hypercube compu...

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CSI/IEEE International Symposium on VLSI Design

作者： R. Mall L.M. Patnaik S. Raman Department of Computer Science and Automation Indian Institute of Science Bangalore India Department of Computer Science and Automation Mircroprocessor Applications Laboratory Supercomputer Education and Research Centre Indian Institute of Science Bangalore India Department of Electrical and Computer Engineering and Coordinated Science Laboratory University of Illinois Urbana-Champaign IL USA

关键词： Computational modeling computer simulation Simulated annealing Routing Hypercubes Signal design Circuit simulation Very large scale integration Parallel processing Coupling circuits

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A parallel algorithm for logic simulation on transputer networks

A parallel algorithm for logic simulation on transputer netw...

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Great Lakes Symposium on VLSI

作者： S. Srinivas A. Basu A. Paulraj L.M. Patnaik Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Centre for Development of Advanced Computing Bangalore India Microprocessor Applications Laboratory Supercomputing Education and Research Center Department of Computer Science and Automation Indian Institute of Science Bangalore India

The authors present a parallel algorithm for logic simulation of VLSI circuits. It is implemented on a network of transputers connected in a ring topology. The approach is based on partitioning a functionality matrix representation of the circuit among the transputers and adopting a data flow technique for the solution. A significant aspect of the algorithm is that it overlaps computation with communication, thereby reducing the communication overhead. It also attempts even distribution of load in order to reduce processor idle time. The algorithm possesses the advantages of ease of implementation and ease of extension to incorporate additional parameters for simulation. Performance results of the algorithm are given.< >

关键词： Parallel algorithms Circuit simulation Computational modeling Concurrent computing Application software Logic circuits Very large scale integration Algorithm design and analysis Logic design Design automation

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FULL-WAVE SOLUTION OF DIELECTRIC LOADED WAVE-GUIDES AND SHIELDED MICROSTRIPS UTILIZING FINITE-DIFFERENCE AND THE CONJUGATE-GRADIENT METHOD

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE computer-AIDED engineering 1991年第4期1卷 346-357页

作者： NARAYANAN, V MANELA, M LADE, RK SARKAR, TK Department of Electrical and Computer Engineering Syracuse University Syracuse New York 13244-1240 Viswanathan Narayanan was born in Bangalore India on December 14 1965. He received the BE degree in Electronics and Communications from B.M.S. College of Engineering Bangalore in 1988. He joined the Department of Electrical Engineering at Syracuse University for his graduate studies in 1989 where he is currently a research assistant. His research interests are in microwave measurements numerical electromagnetics and signal processing. Biographies and photos are not available for M. Manela and R. K. Lade. Tapan K. Sarkar (Sf69-M'76-SM'X1) was born in Calcutta. India on August 2 1948. He received the BTech degree from the Indian Institute of Technology Kharagpur India in 1969 the MScE degree from the University of New Brunswick Fredericton Canada in 1971. and the MS and PhD degrees from Syracuse University. Syracuse NY in 1975. From 1975-1976 he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology (Rochester NY) from 1976-1985. He was a Research Fellow at the Gordon Mckay Laboratory Harvard University Cambridge MA from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “ best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He has authored or coauthored more than 154 journal articles and conference papers and has written chapters in eight books. Dr. Sarkar is a registered professional engineer in the state of New York. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979. He was an Associate Editor for feature articles of the lEEE Antennas arid Propagation Sociefy Newsletter and was

Dynamic analysis of waveguide structures containing dielectric and metal strips is presented. The analysis utilizes a finite difference frequency domain procedure to reduce the problem to a symmetric matrix eigenvalue problem. Since the matrix is also sparse, the eigenvalue problem can be solved quickly and efficiently using the conjugate gradient method resulting in considerable savings in computer storage and time. Comparison is made with the analytical solution for the loaded dielectric waveguide case. For the microstrip case, we get both waveguide modes and quasi-TEM modes. The quasi-TEM modes in the limit of zero frequency are checked with the static analysis which also uses finite difference. Some of the quasi-TEM modes are spurious. This article describes their origin and discusses how to eliminate them. Numerical results are presented to illustrate the principles.

关键词： Waveguides

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A NONLINEAR INVESTIGATION OF THE STATIONARY MODES OF INSTABILITY OF THE 3-DIMENSIONAL COMPRESSIBLE BOUNDARY-LAYER DUE TO A ROTATING-DISK

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QUARTERLY JOURNAL OF MECHANICS AND APPLIED MATHEMATICS 1990年第4期43卷 467-497页

作者： SEDDOUGUI, SO Institute of Computer Applications in Science and Engineering NASA Langley Research Center Hampton Virginia 23665 USA

This work investigates the effects of compressibility on a stationary mode of instability of the three-dimensional boundarylayer due to a rotating disc. The aim is to determine whether this mode will be important in the finite-amplitude destabilizationof the boundary layer. This stationary mode is characterized by the effective velocity profile having zero shear stress atthe wall. Triple-deck solutions are presented for an adiabatic wall and an isothermal wall. It is found that this stationarymode is only possible over a finite range of Mach numbers. Asymptotic solutions are obtained which describe the structureof the wave number and the orientation of these modes as functions of the local Mach number. The effects of nonlinearity areinvestigated allowing the finite-amplitude growth of a disturbance close to the neutral location to be described. The resultsare compared with the incompressible results of Hall (1) and MacKerrell (2).

关键词： Wave number wall Three Dimensions Shear stress Compressibility Mach number Tea Rotating disks boundary layer

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ADAPTIVE MESH GENERATION FOR VISCOUS FLOWS USING DELAUNAY TRIANGULATION

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JOURNAL OF COMPUTATIONAL PHYSICS 1990年第2期90卷 271-291页

作者： MAVRIPLIS, DJ Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton Virginia 23665 USA

A method for generating an unstructured triangular mesh in two dimensions, suitable for computing high Reynolds number flows over arbitrary configurations is presented. The method is based on a Delaunay triangulation, which is perfored in a locally stretched space, in order to obtain very high-aspect-ratio tiangles in the boundary layer and wake regions. It is shown how the method can be coupled with an unstructured Navier-Stokes solver to produce a solution-adaptive mesh generation procedure for viscous flows.

关键词： Viscous flow

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A SIMPLE NONLINEAR MODEL FOR THE RETURN TO ISOTROPY IN TURBULENCE

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PHYSICS OF FLUIDS A-FLUID DYNAMICS 1990年第1期2卷 84-93页

作者： SARKAR, S SPEZIALE, CG Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton Virginia 23665

A quadratic nonlinear generalization of the linear Rotta model for the slow pressure‐strain correlation of turbulence is developed for high Reynolds number flows. The model is shown to satisfy realizability and to give rise to no stable nonzero equilibrium solutions for the anisotropy tensor in the case of vanishing mean velocity gradients. In order for any model to predict a return to isotropy for all relaxational flows, it is necessary to ensure that there is no nonzero stable fixed point that attracts realizable initial conditions. Both the phase space dynamics and the temporal behavior of the model are examined and compared against experimental data for the return to isotropy problem. It is demonstrated that the quadratic model successfully captures the experimental trends which clearly exhibit nonlinear behavior. Comparisons are also made with the predictions of the linear Rotta model, the quasilinear Lumley model, and the nonlinear model of Shih, Mansour, and Moin. The simple quadratic model proposed in this study does better than the Rotta model as anticipated, and also compares quite favorably with the other more complicated nonlinear models.

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The analysis and simulation of compressible turbulence

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Theoretical and Computational Fluid Dynamics 1990年第2期2卷 73-95页

作者： Erlebacher, Gordon Hussaini, M.Y. Kreiss, H.O. Sarkar, S. Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton 23665 VA United States University of California at Los Angeles Los Angeles 90024 CA United States Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton 23665 VA United States

This paper considers compressible turbulent flows at low turbulent Mach numbers. Contrary to the general belief that such flows are almost incompressible (i.e., the divergence of the velocity field remains small for all times), it is shown that even if the divergence of the initial velocity field is negligibly small, it can grow rapidly on a nondimensional time scale which is the order of the fluctuating Mach number. An asymptotic theory which enables a description of the flow in terms of its divergence-free and vorticity-free components has been developed to solve the initial-value problem. As a result, the various types of low Mach number turbulent regimes have been classified with respect to the initial conditions. Formulae are derived that accurately predict the level of compressibility after the initial transients have disappeared. These results are verified by extensive direct numerical simulations of isotropic turbulence. © 1990 Springer-Verlag.

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AN ANNEALING-BASED CIRCUIT PARTITIONER FOR HYPERCUBE ARCHITECTURE: DESIGN AND PERFORMANCE EVALUATION

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International Journal of High Speed Computing 1990年第1期2卷 69-84页

作者： SRILATA RAMAN L.M. PATNAIK Dept. of Electrical and Computer Engineering and Coordinated Science Laboratory University of Illinois at Urbana-Champaign IL 61801 U.S.A Microprocessor Applications Laboratory Dept. of Computer Science and Automation and Supercomputer Education and Research Center Indian Institute of Science Bangalore 560 012 India

This paper discusses the parallel implementation of a hypercube-based circuit partitioning scheme. The circuit partitioner is based on a simulated annealing algorithm and is designed to provide near optimal circuit partitions for simulating the circuits on a hypercube architecture. The circuit partitioning scheme optimizes multiple criteria such as tight coupling of nodes within a subcircuit, load balancing among processors and communication overheads. Design of a partitioner that obtains near optimal solutions satisfying such multiple criteria is difficult using any simple heuristic techniques other than simulated annealing.

关键词： Circuit simulation circuit partitioning simulated annealing hypercube architecture

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PARALLEL IMPLEMENTATION OF CIRCUIT SIMULATION

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International Journal of High Speed Computing 1990年第4期2卷 351-373页

作者： SRILATA RAMAN L.M. PATNAIK R. MALL Dept. of Electrical and Computer Engineering and Coordinated Science Laboratory University of Illinois at Urbana-Champaign IL 61801 U.S.A Microprocessor Applications Laboratory Indian Institute of Science Bangalore 560 012 India Supercomputer Education and Research Centre Indian Institute of Science Bangalore 560 012 India Dept. of Computer Science and Automation Indian Institute of Science Bangalore 560 012 India

The importance of circuit simulation in the design of VLSI circuits has channelised research work in the direction of finding methods to speedup this highly compute-intensive problem. On one hand, attempts have been made to find better algorithms and use faster hardware; and on the other hand, to use parallel architectures for accelerating the circuit simulation task. In this paper, we examine the various issues involved in parallelizing two well-known circuit simulation approaches – direct methods and relaxation methods. A number of parallel computer architectures which have been used for this purpose are also surveyed.

关键词： Circuit simulation VLSI circuit design direct method relaxation method parallel processing

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