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Transport Equation Based Wall Distance Computations Aimed at Flows with Time-Dependent Geometry

Transport Equation Based Wall Distance Computations Aimed at Flows with Time-Dependent Geometry


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About the Book

Eikonal, Hamilton-Jacobi and Poisson equations can be used for economical nearest wall distance computation and modification. Economical computations may be especially useful for aeroelastic and adaptive grid problems for which the grid deforms, and the nearest wall distance needs to be repeatedly computed. Modifications are directed at remedying turbulence model defects. For complex grid structures, implementation of the Eikonal and Hamilton-Jacobi approaches is not straightforward. This prohibits their use in industrial CFD solvers. However, both the Eikonal and Hamilton-Jacobi equations can be written in advection and advection-diffusion forms, respectively. These, like the Poisson's Laplacian, are commonly occurring industrial CFD solver elements. Use of the NASA CFL3D code to solve the Eikonal and Hamilton-Jacobi equations in advective-based forms is explored. The advection-based distance equations are found to have robust convergence. Geometries studied include single and two element airfoils, wing body and double delta configurations along with a complex electronics system. It is shown that for Eikonal accuracy, upwind metric differences are required. The Poisson approach is found effective and, since it does not require offset metric evaluations, easiest to implement. The sensitivity of flow solutions to wall distance assumptions is explored. Generally, results are not greatly affected by wall distance traits.Tucker, Paul G. and Rumsey, Christopher L. and Bartels, Robert E. and Biedron, Robert T.Langley Research CenterTRANSPORT THEORY; TIME DEPENDENCE; WALL FLOW; COMPUTATIONAL FLUID DYNAMICS; HAMILTON-JACOBI EQUATION; EIKONAL EQUATION; ADVECTION; BODY-WING CONFIGURATIONS; AIRFOILS


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Product Details
  • ISBN-13: 9781721030279
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 216 mm
  • ISBN-10: 1721030271
  • Publisher Date: 12 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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Transport Equation Based Wall Distance Computations Aimed at Flows with Time-Dependent Geometry
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