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On supercomputerssuch as the Cray Y-MP and the Cray-2, multitasking, microtasking, and autotasking are available. Multitasking is a mechanismfor multiprocessing at a subroutine level. ... The Cray-2-Unicos- Fortran implementation, on the other hand, provides a Multitasking Library, callable from Fortran, which offers a wide spectrum of multitasking capabilities. ... The solver is applied to a generic oblique-wing aircraft problem on a four processor Cray-2 computer. ...doi:10.1177/109434209100500204 fatcat:jdrqjtuqczgt5dajfrkjhpy7ze
This code, along with the tetrahedral grid generator, VGRIDns, is being extensively used throughout the U.S. for solving the Euler and Navier-Stokes equations on complex aerodynamic problems. ... The issues of accuracy and robustness of USM3Dns Navier-Stokes capabilities are addressed for a flat-plate boundary layer, and a full F-16 aircraft with external stores at transonic speed. ... David Whitaker, Cray Research, for efficiently multitasking the USM3Dns code. All computations were performed on the Numerical Aerodynamic simulation (NAS) facility at NASA Ames Research Center. ...doi:10.1002/(sici)1097-0363(19990915)31:1<175::aid-fld962>3.0.co;2-v fatcat:g6fdh3pkibbqneuimkcvq53bwu
Various stages of the finite element solution are parallelized and the code is implemented on a four-processor CRAY Y-MP supercomputer applying multitasking techniques in a dedicated environment.” 94c: ... The authors present a complete implicit algorithm for comput- ing approximating solutions of the two-dimensional axisymmetric, time-dependent compressible Euler- and thin-layer Navier-Stokes- flow over ...
Journal of Aircraft
., ‘Simulation of Aircraft Component Flowfields Using a Three- Dimensional Navier-Stokes Algorithm,’’ 3rd International Sympo- sium on Science and Engineering on Cray Supercomputers, Cray Research, Inc ... The flow simulations are based on solutions of the full Reynolds-averaged Navier- Stokes equations using an implicit finite-difference algorithm. ...doi:10.2514/3.46076 fatcat:mzuoq662gjg6nkulsszmjse5se
Autotasking, the parallel processing capability representing the third phase of multitasking libraries on CRAY Y-MP, has been exploited and successfully applied to both loop and subroutine level parallelization ... The Navier-Stokes equations are recast into a set of first-order coupled nonlinear partial differential equations using stresses and heat fluxes as auxiliary variables, which permits the use of C° element ...
Parallel Algorithms for Matrix Computations
Vectorization of a penalty function algorithm for well scheduling, in Gary  I. ABU-SHOMAYS . ... Experimental results f o r vector processing on the Alliant FX/8, Tech. ... Vectoriration of implicit Navier-Stokes codes on the CRAY-1 computer, Tech. Report, Department of Aeronautics and Astronautics, Stanford University.  P . BURKE, B . DAVIES, A N D D. ...doi:10.1137/1.9781611971705.ch3 fatcat:pkjwqy26bfcjneyf76jqebybei
The Langley Aerothermodynamic Upwind Relaxation Algorithm LAURA, a Navier-Stokes solver, has been modi ed for use in a parallel, distributed-memory environment using the Message-Passing Interface MPI standard ... Performance is examined on dedicated parallel machines and a network of desktop workstations. ... for his help in pro ling LAURA on the IBM SP2. ...doi:10.1016/s0965-9978(97)00074-4 fatcat:3626k2h26zcznih7kn5hkchcuu
A finite time singularity for the Euler equation is not excluded as the result of interactions among these filaments. ... The spontaneous emergence of flat pancakelike structures that shrink exponentially in time is observed. A simple self-similar model that fits these observations is discussed. ... The calculations were done on the Cray-2 of the Centre de Calcul Vectoriel Pour la Recherche (Palaiseau, France). ...doi:10.1063/1.858513 fatcat:ghtyy7rfzrcbrmushmkf52kto4
For the inviscid cases listed in Table 1, DPLUR requires 100 node h per solution on an IBM SP-2, and LAURA requires about 25 h per solution on a Cray Y-MP. ... C., “Application of an Upwind Algorithm to the Three-Dimensional Parabolized Navier-Stokes Equations,” AIAA Paper 87-1112, June 1987. '2Wurster, K. E., Riley, C. J., and Zoby, E. ...doi:10.2514/2.3451 fatcat:ieezmkbsq5etvelybgznaskaoy
Tenth International Conference on Numerical Methods in Fluid Dynamics
ACKNOWLED GEMENTS This research is funded in part by the NASA Ames Research Center (NCC-2-344) and the Air Force Office of Scientific Research (AFOSR-85-289). ... Some of the computing time has been contributed by Cray Research, Inc. All of this support is gratefully acknowledged. ... The entire algorithm is vectorised and multitasked to run on a four-processor Cray X-MP or Cra 2. Sample results for a subcritical flow over a swept blade are shown in Fig. 3 . ...doi:10.1007/bfb0041815 fatcat:es63xvduhjb2niwrmnkuidc7ie
2004 Users Group Conference (DOD_UGC'04)
Also, a high-order overset grid capability was validated. ... An advanced simulation capability has been applied to this investigation was made to document the effect of plunge class of problems. The proposed paper will document motion on turbulent transition. ... and subsequent development of a allowing for more effective utilization of existing high-order k-epsilon model and a Reynolds Averaged resources.The development of this capability permits the Navier-Stokes ...doi:10.1109/dod_ugc.2004.21 fatcat:tcturga36ve2vcayuyrnxwm7nq
These are very fast, powerful machines with operation counts of one half gigaflop or more. They include the CRAY X-MP, CRAY 2, Fujitsu, Hitachi, NEC, ETA, and perhaps the CYBER 205. ... These include, for example, the Connection Machine, Butterfly Machine, Navier-Stokes Computer (Princeton), the various hypercube machines, and systolic arrays. 3. Super-minicomputers. ... Acknowledgements This work was sponsorted by the Office of Naval Research through the Naval Research Laboratory. ...doi:10.1051/jphyscol:1987424 fatcat:cwnkbz7yhraa7a3l45ko4l545q
This paper is devoted to a comparison of various iterative solvers for the Stokes problem, based on the preconditioned Uzawa approach. ... In the first section the basic equations and general results of gradient-like methods are recalled. Then a new class of preconditioners, whose optimality will be shown, is introduced. ... DISCRETIZED UZAWA ALGORITHM: COMPUTATION ...doi:10.1002/fld.1650080802 fatcat:un325nzmcbft3gszmsd675npke
The machines used were an 8 processor Cray Y-MP, a 32768 processor CM-2, and a 128 processor iPSC/860. ... The CM-2 is the slowest machine, but it has I/O that is fast relative to its computational performance. This resulted in typical I/O overheads on the CM-2 of less than 4%. ... The governing differential equations representing the physical laws governing fluids in motion are referred to as the Navier-Stokes equations. ...doi:10.1145/165660.165665 fatcat:xmyty35w7nh4lhro4jrgzruvp4
One realistic problem arising from a 3-D ow calculation achieves factorization rates of 1.0, 2.5, 0.8 and 0.8 Giga ops, on the 12 processor Power Challenge, 8 processor Cray C90, 16 processor Cray J90, ... The high performance of our algorithm is achieved through 1 using a graph reduction technique and a supernode-panel computational kernel for high single processor utilization, and 2 scheduling two t ypes ... We thank Kathy Y elick for suggestions on the presentation of the performance analysis section. We thank Osni Marques and Peter Tang for suggestions on improving the presentation of the material. ...doi:10.1137/s0895479897317685 fatcat:mrbvunytwzfldlhyqypbqe3nhq
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