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Saturday, August 1, 2020 | History

3 edition of Visualizing time-varying phenomena in numerical simulations of unsteady flows found in the catalog.

Visualizing time-varying phenomena in numerical simulations of unsteady flows

Visualizing time-varying phenomena in numerical simulations of unsteady flows

  • 134 Want to read
  • 19 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Algorithms.,
  • Flow visualization.,
  • Flow distribution.,
  • Unsteady flow.,
  • Steady flow.,
  • Computerized simulation.,
  • Time dependence.,
  • Vortices.

  • Edition Notes

    Other titlesVisualizing time varying phenomena in numerical simulations of unsteady flows
    StatementDavid A. Lane.
    SeriesNASA contractor report -- NASA CR-203390.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17129102M

      Unsteady flow phenomena over delta wings at high angle of attack. Ismet Gursul ; Ismet Gursul. University of Cincinnati, Cincinnati, Ohio Unsteady Vortex Flows and Buffeting of a Low Sweep Delta Wing. Numerical simulation of a 65 Cited by: 28 May Unsteady flows inside structures: high-speed visualization as a tool for numerical modeling and code validation. Classical visualization techniques and pressure measurements--supplemented by numerical simulations--were used to analyze the flow field. Peter Neuwald, Hartmut Klein, and Heinz Reichenbach "Unsteady flows inside Cited by: 2.

    A novel numerical method is developed that integrates boundary-conforming grids with a sharp interface, immersed boundary methodology. The method is intended for simulating internal flows containing complex, moving immersed boundaries such as those encountered in Cited by: the numerical oscillations were often reported during the numerical simulation of the unsteady rotating disk flows (Attia, ; Hossain, et al. ). The cousins of numerical methods based on the finite difference approximations of derivatives as presented in the book by Book () are also susceptible to the same difficulty.

    Paper A The State of the Art in Topology-based Visualization of Unsteady Flow 43 Vector field topology (VFT) and feature extraction build a solid base for under-standing and visualizing a given steady flow field, and there is a considerable amount of work available on possible direct extensions of VFT for unsteady flows. EngD Conference, 2nd July 1 Unsteady flow simulation of a vertical axis wind turbine: a two-dimensional study R. Nobile1, *, M. Vahdati, J.F. Barlow, A. Mewburn-Crook2 1TSBE Centre, University of Reading, United Kingdom, @ 2Matilda’s Planet Manufacturing Ltd, Margam Port Talbot, United Kingdom ABSTRACT As the integration of vertical axis wind turbines in the built.


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Visualizing time-varying phenomena in numerical simulations of unsteady flows Download PDF EPUB FB2

The time-varying phenomena in the unsteady flow. Although the approach described above is simple and commonly used, it is not always the most effective way to visualize unsteady flows. Phenomena such as vortex shedding, vortex breakdown, and shock waves evolve in time, and in order to depict these phenomena, time should be considered in the calculation.

Visualizing Time-Varying Phenomena In Numerical Simulations Of Unsteady Flows In experimental flow visualization, the behavior of the flow is analyzed by continuously injecting smoke or dye into the flow from some fixed seed locations. The smoke or dye Cited by: Although instantaneous flow visualization techniques are effective for depicting phenomena in steady flows, they sometimes do not adequately depict time-varying phenomena in unsteady flows.

Streaklines and timelines are effective visualization techniques for depicting vortex shedding, vortex breakdown, and shock waves in unsteady flows. 3D unsteady ßow simulations are saved at a coarse resolution, for example, at every 50th or th time step due to disk limitation.

Hence, numerical streaklines may not always be smooth. For this reason, numerical streaklines usually are not connected because. During the past decade, advances to computer hardware and numerical methods have permitted the development of computer programs capable of simulating unsteady interactive flows.

The physical realism of the simulated unsteady flows has been validated by Author: George S. Deiwert, Harry E. Bailey. Numerical simulation of streaklines in unsteady flows. Visualizing Time-Varying Phenomena In Numerical Simulations Of Unsteady Flows.

The final design of the very high temperature reactor (VHTR) of the fourth generation of nuclear power plants (Gen IV) has not yet been established. The VHTR may be either a prismatic (block) or pebble bed type. It may be either gas-cooled or cooled with an as yet unspecified molten salt. However, a conceptual design of a gas-cooled VHTR, based on the General Atomics GT-MHR, does exist and is Cited by: 4.

Numerical Simulations of Unsteady, Viscous, 1 c Transonic Flow Over Isolated and Cascaded Airfoils Using a Deforming Grid (&AS A-T M- 8 9 8 9 0) lCIUl&.BJaH EU F AT IC blS OF UPSIIEADY, VISCCZS, TRAESOIIC ElOW OVEB ISCLALED AND CASCAEED AIRPCIL6 CSIlYC A CEFCPHING GRID (BASA) 16 p Avail: HTXS Uaclas.

NUMERICAL SIMULATION OF UNSTEADY CAVITATING FLOWS: SOME APPLICATIONS AND OPEN PROBLEMS JL. Reboud As the first attempt to simulate unsteady cavitation phenomena Furness and Hutton [1] con sider the deformation of compressible or incompressible simulations the efficiency of the numerical scheme decreases dramatically.

That problem was. Numerical simulation of unsteady flows over a slow-flying bat Article (PDF Available) in Theoretical and Applied Mechanics Letters 5(1) January with Reads How we measure 'reads'. Unsteady numerical simulations of the model were then conducted at low tip speed ratios, and 1.

The steady state performance of the model was also conducted at three different orientations of the airfoils using different wind speed s. For the simulation of steady cases, flow convergence is obtained after approximately 90 scalar hours for simulations using mesh sphereA and hours for simulations using mesh sphereB.

For unsteady simulations, the CFL number has been fixed to Cited by: 4. Each steady-state run required 2–10 hours of execution time on the aforementioned hardware, whereas each unsteady simulation had to run for approximately 2 weeks.

In the sequel, we shall present results from two kinds of simulations: steady cavitating flows and unsteady cavitating by: The numerical resolution is a pressure‐correction method derived from the SIMPLE algorithm, with a finite volume discretization.

The standard scheme is slightly modified to take into account the cavitation phenomenon. That numerical model is used to calculate unsteady cavitating flows. The above presents a three dimensional direct numerical simulation using high-order methods has been performed to study the flow around the asymmetric NACA wing at a moderate chord Reynolds number (Rec = ,), with an angle of attack of 5 degrees.

This flow regime corresponds approximately to the flow around a small glider. Abstract. A new formulation of Detached-Eddy Simulation (DES) based on the k-ω RANS model of Menter (M-SST model) is presented, the goal being an improvement in separation prediction over the S-A model.A new numerical scheme adjusted to the hybrid nature of the DES approach and the demands of complex flows is also by: Atherosclerosis is a cardiovascular condition that can occur in any part of the vascular system.

Especially, it can exist in bifurcated arteries such as the left and right coronary arteries, abdomi Author: Bo Zhang, Yilun Jin, Xiaoran Wang, Taisheng Zeng, Liansheng Wang.

Numerical predictions of the flow phenomena of water were performed for g/w ratios of, and It was observed from the experimental investigation that various obstruction geometries (except flat plate) produced the maximum reverse flow at g/w ratio of [1]. Therefore, the numerical simulations for the g/w.

The objective of this paper is to evaluate the predictive capability of three popular transport equation-based cavitation models for the simulations of partial sheet cavitation and unsteady sheet/cloud cavitating flows around a stationary NACA66 hydrofoil.

The 2D calculations are performed by solving the Reynolds-averaged Navier-Stokes equation using the CFD solver CFX with the k-&# Cited by: JOURNAL OF LATEX CLASS FILES, VOL. 14, NO. 8, AUGUST 1 Visualizing Time-Varying Particle Flows with Diffusion Geometry Matthew Berger and Joshua A.

Levine Abstract—The tasks of identifying separation structures and clusters in flow data are fundamental to flow ficant work has been devoted to these tasks in flow represented by vector fields.

Experimental and numerical aspects of simulating unsteady flows around the X configuration Andreas Schütte1 tests and the numerical simulation of a guided flight maneuver of the X configuration taking several moving which refines and de-refines the grid in order to capture flow phenomena like vortex structures and shear layers.Numerical scheme The numerical simulation on 3-D flow around moving objects is in fact a problem of seeking the numerical solution of the unsteady N-S equation under dynamic mesh.

Correspondingly, the numerical discretization method must consider the discretization of grid cell velocity. The geometric conservation law.The simulation of unsteady aerodynamics using the numerical method of lines.

David Matthew Kuzo David Matthew, "The simulation of unsteady aerodynamics using the numerical method of lines." ().Theses and Dissertations. algorithm for the simulation of the unsteady flow field result.