A conservative approach for flow field calculations on multiple grids

progress report for the period ended March 31, 1988
  • 4.62 MB
  • English

Old Dominion University Research Foundation, National Aeronautics and Space Administration, National Technical Information Service, distributor , Norfolk, Va, [Washington, DC, Springfield, Va
Fluid dynamics -- Mathematical models., Fluid mechanics -- Mathematical mo
Statementby Monchai Kathong and Surendra N. Tiwari, principal investigator.
SeriesNASA contractor report -- NASA CR-185313.
ContributionsTiwari, S. N., United States. National Aeronautics and Space Administration.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL15393224M

Get this from a library. A conservative approach for flow field calculations on multiple grids: progress report for the period ended Ma [Monchai Kathong; S N Tiwari; United States. National Aeronautics and Space Administration.]. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

The present method, strictly based on a conservative constraint, is tested with overlaid grids for various applications of unsteady and steady supersonic inviscid flows with strong shock waves.

Air Flow Grids. Air Flow Grids are portable test equipment that indicate face air velocity on grills, diffusers, registers, exhaust hoods, coils, filters, dampers and similar restrictions.

Model G Extends Over 50" to Aid in Air Flow Output Checks. This is a transonic flow case for which experimental results are available in the literature to compare [7].At inflow Mach number of and angle of attack of degrees, the adapted meshes and Mach number contours for levels 2 and 3 are shown in Figure 3, along with the initial mesh increased sharpness of the shock regions is evident from the results.

This chapter continues the presentation of a new parallel computational fluid dynamics (CFD) algorithm on unstructured grids. The chapter demonstrates the code's ability to solve the 3-D Navier-Stokes equations. The 2-D and 3-D results presented show excellent performance both in terms of accuracy and efficiency.

Conservative Finite-Difference Methods on General Grids is completely self-contained, presenting all the background material necessary for understanding.

The book provides the tools needed by scientists and engineers to solve a wide range of practical engineering problems. An abundance of tables and graphs support and explain methods. () An efficient phase-field-based multiple-relaxation-time lattice Boltzmann model for three-dimensional multiphase flows.

Computers & Mathematics with Applications() A new coupled level set and volume-of-fluid method to capture free surface on an overset grid by: For the sphere, one special overset grid, referred to in the literature as the Yin–Yang Grid (YYG), has been proposed and tested with shallow water and full three dimensional models.The YYG is an overset grid that divides the sphere into two rectangular sub-domains, which are combined to cover the whole sphere (see Fig.

2).From a computational point of view, the YYG grid has. Calculations utilizing H 4 in repeated pressure field calculations save time by evaluating a single one-dimensional integral instead of a two-dimensional integral or multiple one-dimensional integrals, and because H 4 reduces the computation time, this expression is recommended for preliminary designs of sparsely and densely populated therapy Cited by: Field flow techniques are powerful and potentially useful in a wide range of application areas.

A number of texts describe the theory in considerable detail, but very, very few provide any real information about assembling an FFF system.

This does. As well as including specialists' writing about applications using FFF, and the obligatory 5/5(1).

A low-order flow/acoustics interaction method for the prediction of sound propagation and diffraction in unsteady subsonic compressible flow using adaptive 3-D hybrid grids is investigated. The total field is decomposed into the flow field described by the Euler equations, and the acoustics part described by the Nonlinear Perturbation Equations.

Comparison of experimental data with model calculations is used to draw conclusions about the wake flowfield. It is concluded that the numerical wake model can be used with confidence to calculate the wake velocity field for wind turbines over a range of sizes and in a variety of meteorological conditions.

I0 A.M. Talmon, The wake of a Cited by: Multiple Grid Blocks.

Details A conservative approach for flow field calculations on multiple grids PDF

A good way to extend the usefulness of rectangular grids is to employ multiple rectangular grids that are coupled at their boundaries.

There are two simple possibilities as illustrated in Fig. 1A and Fig. The linked blocks are connected by boundary conditions where the blocks are adjacent to one another. Field flow fractionation (FFF) is an emerging separation technique, which has been proven successful in the analysis of pharmaceuticals, biotechnology products, polymers, soils, and foods, among others.

In this book, Martin Schimpf joins forces with Karin Caldwell and J. Calvin Giddings, two of the primary developers of this technique, to bring you the first Reviews: 1. A Method for Flow Simulation About Complex Geometries Using Both Structured and Unstructured Grids James R. DeBonis Lewis Research Center Cleveland, Ohio (NASA-TM-I) A METHOD FOR FLOW SIMULATION ABOUT COMPLEX GEOMETRIES USING BOTH STRUCTURED AND UNSTRUCTURE00RIOS (NASA.

Lewis Research Center) 60 p GSloz File Size: 1MB. Since a number of finite‐volume‐based groundwater flow models, such as MODFLOW‐USG (Panday et al. ) or HydroGeoSphere (Therrien et al. ) support nonrectilinear grid cells, it is desirable to identify means by which mass‐conservative and accurate subcell velocity fields may be generated for arbitrary unstructured grids.

The Cited by: 1. Flow is modeled using two basic attributes Flow Direction (FD) The direction water flows at a point Flow Accumulation (FA) Total amount of water that flows through a point (if water is distributed according to the flow directions) Flow Direction (FD) on Grids Water flows downhill follows the gradient On grids: Approximated using 3x3.

An Approach for Dynamic Grids John W. Slater and Meng-Sing Liou Lewis Research Center Cleveland, Ohio Richard G.

Hindman Iowa State University of Science and Technology Ames, Iowa Prepared for the 32nd Aerospace Sciences Meeting and Exhibit sponsored by the American Institute of Aeronautics and Astronautics RenD, Nevada, Januarywhere the sum is over the faces of cell 0, S 0k is the directed area of the face separating cell 0 from cell k, and the flux F 0k is evaluated by taking the average of its value in cell 0 and cell k.

F 0k = 1 2 (F 0 +F k) () An alternative averaging procedure is to multiply the average value of the convected quantity, ρ. Pirzadeh, S., “Vortical Flow Prediction Using an Adaptive Unstructured Grid Method,” Symposium on Advanced Flow Management.

Part A: Vortex Flow and High Angle of Attack, NATO RTO-MP, May The AFG Flow Grids are supplied in kit form, and tube lengths are cut to suit the required duct size by the customer. The AFG Flow Grid is available in two tube diameters and lengths (See Table 1).

Table 1: Dimensions They may be used in square, rectangular or round ducts. Unpack your AFG Flow Grid.

The kit should contain the following parts:File Size: KB. Skip to main content. Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid ers are used to perform the calculations required to simulate the free-stream flow of the fluid, and the interaction of the fluid (liquids and gases) with surfaces defined by boundary conditions.

Flow Computation on Massive Grids Laura Toma Rajiv Wickremesinghe Lars Arge Jeffrey S. Chase Jeffrey Scott Vitter Department of Computer Science, Duke University, Durham, NC Patrick N. Halpin Dean Urban Nicholas School of the Environment, Duke University, Durham, NC ABSTRACT As detailed terrain data becomes available, GIS applications.

Available with Spatial Analyst license. The Flow Accumulation tool calculates accumulated flow as the accumulated weight of all cells flowing into each downslope cell in the output raster.

If no weight raster is provided, a weight of 1 is applied to each cell, and the value of cells in the output raster is the number of cells that flow into each cell. The output of the Flow Direction tool is an integer raster whose values range from 1 to be coded as If a cell is lower than its eight neighbors, that cell is given the value of its lowest neighbor, and flow is defined toward this cell.

If multiple neighbors have the lowest value, the cell is still given this value, but flow is.

Description A conservative approach for flow field calculations on multiple grids EPUB

Computational fluid dynamics This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations.

(September ) (Lear. Output Based Grid Adaptation for Viscous Flow Julie C. Andren1 and Michael A.

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Park2 1 Massachusetts Institute of Technology, [email protected] 2 NASA Langley Research Center, Computational AeroSciences Branch, @ 1 Introduction Output (adjoint) based adaptation is a method that has been used to auto. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA.

MCnet Edinburgh /36 MCgrid: projecting cross section calculations on grids Luigi Del Debbioa, Nathan Hartlanda,b, Ste en Schumannb aThe Higgs Centre for Theoretical Physics, University of Edinburgh, UK.

alisches Institut, Georg-August-Universit at G ottingen, G ottingen, by: Energy-Based Mathematical Modelling of the Flow Field in Bubble Columns [A. K. Sulayman] on *FREE* shipping on qualifying offers. Energy-based mathematical modelling and computational fluid mechanics were used to analyse the bubble-street phenomenon under laminar flow conditions in bubble columns.

The accompanying software/GWBASIC [email protected]{osti_, title = {Fully-coupled solution of pressure-linked fluid flow equations}, author = {Vanka, S. P. and Leaf, G. K.}, abstractNote = {A robust and efficient numerical scheme has been developed for the solution of the finite-differenced pressure linked fluid flow equations.

The algorithm solves the set of nonlinear simultaneous equations by a .