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  • FLUID MECHANICS AND HEAT TRANSFER  (731)
  • 1990-1994  (731)
  • 1985-1989
  • 1993  (731)
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  • 1990-1994  (731)
  • 1985-1989
Year
  • 1
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    A bi-directional two-phase/two-phase heat exchanger (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the design and test of a heat exchanger that transfers heat from one two-phase thermal loop to another with very small drops in temperature and pressure. The heat exchanger condenses the vapor in one loop while evaporating the liquid in the other without mixing of the condensing and evaporating fluids. The heat exchanger is bidirectional in that it can transfer heat in reverse, condensing on the normally evaporating side and vice versa. It is fully compatible with capillary pumped loops and mechanically pumped loops. Test results verified that performance of the heat exchanger met the design requirements. It demonstrated a heat transfer rate of 6800 watts in the normal mode of operation and 1000 watts in the reverse mode with temperature drops of less than 5 C between two thermal loops.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-2852 , ; 13 p.|AIAA, Thermophysics Conference; Jul 06, 1993 - Jul 09, 1993; Orlando, FL; United States
    Format: text
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  • 2
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    A CFD validation roadmap for hypersonic flows (1993)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A roadmap for computational fluid dynamics (CFD) code validation is developed. The elements of the roadmap are consistent with air-breathing vehicle design requirements and related to the important flow path components: forebody, inlet, combustor, and nozzle. Building block and benchmark validation experiments are identified along with their test conditions and measurements. Based on an evaluation criteria, recommendations for an initial CFD validation data base are given and gaps identified where future experiments would provide the needed validation data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AGARD, Theoretical and Experimental Methods in Hypersonic Flows; 16 p
    Format: text
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  • 3
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    A comparative study of computational solutions to flow over a backward-facing step (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A comparative study was conducted for computational fluid dynamic solutions to flow over a backward-facing step. This flow is a benchmark problem, with a simple geometry, but involves complicated flow physics such as free shear layers, reattaching flow, recirculation, and high turbulence intensities. Three Reynolds-averaged Navier-Stokes flow solvers with k-epsilon turbulence models were used, each using a different solution algorithm: finite difference, finite element, and hybrid finite element - finite difference. Comparisons were made with existing experimental data. Results showed that velocity profiles and reattachment lengths were predicted reasonably well by all three methods, while the skin friction coefficients were more difficult to predict accurately. It was noted that, in general, selecting an appropriate solver for each problem to be considered is important.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: The Fifth Annual Thermal and Fluids Analysis Workshop; p 523-530
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  • 4
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    A comparative study of turbulence decay using Navier-Stokes and a discrete particle simulation (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A comparative study of the two dimensional temporal decay of an initial turbulent state of flow is presented using a direct Navier-Stokes simulation and a particle method, ranging from the near continuum to more rarefied regimes. Various topics related to matching the initial conditions between the two simulations are considered. The determination of the initial velocity distribution function in the particle method was found to play an important role in the comparison. This distribution was first developed by matching the initial Navier-Stokes state of stress, but was found to be inadequate beyond the near continuum regime. An alternative approach of using the Lees two-sided Maxwellian to match the initial strain-rate is discussed. Results of the comparison of the temporal decay of mean kinetic energy are presented for a range of Knudsen numbers. As expected, good agreement was observed for the near continuum regime, but the differences found for the more rarefied conditions were unexpectedly small.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-3093 , AIAA, Fluid Dynamics Conference; Jul 06, 1993 - Jul 09, 1993; Orlando, FL; United States|; 9 p.
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  • 5
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    A comparison of TSS and TRASYS in form factor calculation (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: As the workstation and personal computer become more popular than a centralized mainframe to perform thermal analysis, the methods for space vehicle thermal analysis will change. Already, many thermal analysis codes are now available for workstations, which were not in existence just five years ago. As these changes occur, some organizations will adopt the new codes and analysis techniques, while others will not. This might lead to misunderstandings between thermal shops in different organizations. If thermal analysts make an effort to understand the major differences between the new and old methods, a smoother transition to a more efficient and more versatile thermal analysis environment will be realized.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: The Fifth Annual Thermal and Fluids Analysis Workshop; p 41-46
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  • 6
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    A comparison of two formulations for high-order accurate essentially non-oscillatory schemes (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The finite-volume and finite-difference implementations of high-order accurate essentially nonoscillatory shock-capturing schemes are discussed and compared. Results obtained with fourth-order accurate algorithms based on both formulations are examined for accuracy, sensitivity to grid irregularities, resolution of waves that are oblique to the mesh, and computational efficiency. Some algorithm modifications that may be required for a given application are suggested. Conclusions that pertain to the relative merits of both formulations are drawn, and some circumstances for which each might be useful are noted.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-3338 , In: AIAA Computational Fluid Dynamics Conference, 11th, Orlando, FL, July 6-9, 1993, Technical Papers. Pt. 1 (A93-44994 18-34); p. 462-470.
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  • 7
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    A comparison of two incompressible Navier-Stokes algorithms for unsteady internal flow (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A comparative study of two different incompressible Navier-Stokes algorithms for solving an unsteady, incompressible, internal flow problem is performed. The first algorithm uses an artificial compressibility method coupled with upwind differencing and a line relaxation scheme. The second algorithm uses a fractional step method with a staggered grid, finite volume approach. Unsteady, viscous, incompressible, internal flow through a channel with a constriction is computed using the first algorithm. A grid resolution study and parameter studies on the artificial compressibility coefficient and the maximum allowable residual of the continuity equation are performed. The periodicity of the solution is examined and several periodic data sets are generated using the first algorithm. These computational results are compared with previously published results computed using the second algorithm and experimental data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-108794 , A-94007 , NAS 1.15:108794
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  • 8
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    A comparison of two methods for solving 3-D unsteady compressible viscous flows (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Numerical solutions of 3D unsteady compressible flows for several steady and unsteady cases are obtained using two procedures - a noniterative Alternating Direction Implicit (ADI) scheme and a Generalized Minimal RESidual (GMRES) method. Results obtained are compared with each other and also with experimental data. It is found that the GMRES procedure can provide significant speedups compared to the noniterative ADI procedure.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 93-0537 , AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States|; 10 p.
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  • 9
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    A comprehensive comparison of turbulence models in the far wake (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In the present study, the far wake was examined numerically using an implicit, upwind, finite-volume, compressible Navier-Stokes code. The numerical grid started at 500 equivalent circular cylinder diameters in the wave, and extended to 4000 equivalent diameters. By concentrating only on the far wake, the numerical difficulties and fine mesh requirements near the wake-generating body were eliminated. At the time of this writing, results for the K-epsilon and K-omega turbulence models at low Mach number have been completed and show excellent agreement with previous incompressible results and far-wake similarity solutions. The code is presently being used to compare the performance of various other turbulence models, including Reynolds stress models and the new anisotropic two-equation turbulence models being developed at NASA Langley. By increasing our physical understanding of the deficiencies and limits of these models, it is hoped that improvements to the universality of the models can be made. Future plans include examination of two-dimensional momentumless wakes as well.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Old Dominion Univ., The 1993 NASA-ODU American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program; p 80-82
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  • 10
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    A controlled variation scheme for convection treatment in pressure-based algorithm (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Convection effect and source terms are two primary sources of difficulties in computing turbulent reacting flows typically encountered in propulsion devices. The present work intends to elucidate the individual as well as the collective roles of convection and source terms in the fluid flow equations, and to devise appropriate treatments and implementations to improve our current capability of predicting such flows. A controlled variation scheme (CVS) has been under development in the context of a pressure-based algorithm, which has the characteristics of adaptively regulating the amount of numerical diffusivity, relative to central difference scheme, according to the variation in local flow field. Both the basic concepts and a pragmatic assessment will be presented to highlight the status of this work.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Eleventh Workshop for Computational Fluid Dynamic Applications in Rocket Propulsion; p 1889-1908
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