A New Solution-Adaptive Grid Generation Method for Transonic Airfoil Flow Calculations PDF Download
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723401305
Category :
Languages : en
Pages : 26
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Book Description
The clustering algorithm is controlled by a second-order, ordinary differential equation which uses the airfoil surface density gradient as a forcing function. The solution to this differential equation produces a surface grid distribution which is automatically clustered in regions with large gradients. The interior grid points are established from this surface distribution by using an interpolation scheme which is fast and retains the desirable properties of the original grid generated from the standard elliptic equation approach. Nakamura, S. and Holst, T. L. Ames Research Center NASA-TM-81330, A-8733 NCA2-OR565-901
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723401305
Category :
Languages : en
Pages : 26
Get Book Here
Book Description
The clustering algorithm is controlled by a second-order, ordinary differential equation which uses the airfoil surface density gradient as a forcing function. The solution to this differential equation produces a surface grid distribution which is automatically clustered in regions with large gradients. The interior grid points are established from this surface distribution by using an interpolation scheme which is fast and retains the desirable properties of the original grid generated from the standard elliptic equation approach. Nakamura, S. and Holst, T. L. Ames Research Center NASA-TM-81330, A-8733 NCA2-OR565-901
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Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Author:
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Category :
Languages : en
Pages : 42
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Author: D. Nixon
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ISBN:
Category :
Languages : en
Pages : 12
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This report summarizes work concerned with some topics connected with a transonic flow theory and also some problems in adaptive mesh procedures. The work on adaptive mesh procedures is concerned with the development of adaptive mesh strategies and solution procedures for highly clustered adaptive meshes. It has been found that the strong conservation law form of the governing equations in computational variables cannot capture the shock waves correctly for arbitrary clustering. Methods for correcting this problem have been investigated. The work on transonic flow theory is concerned with the existence of multiple solutions in full potential calculations. Since the full potential equation is difficult to analyze compared with small disturbance equation, multiple solutions have been found using transonic small disturbance theory. These results have been analyzed using the transonic integral equation theory and indicate that the transonic potential theory is not formulated uniquely.
Author: Dun Charles Liu
Publisher:
ISBN:
Category : Aerodynamics, Transonic
Languages : en
Pages : 502
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Category : Airframes
Languages : en
Pages : 876
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Author: Yen Tu
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ISBN:
Category : Aerodynamics
Languages : en
Pages : 204
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A solution-adaptive grid generation procedure is developed and applied to three-dimensional inviscid transonic fluid flow around complex geometries using a composite block grid structure. The adaption is based upon control functions in an elliptic grid generation system. The control function is constructed in a manner such that a proper grid network can be generated as a fluid flow solution is evolving. The grid network is boundary-conforming for accurate representation of boundary conditions. The procedure implemented allows orthogonality at boundaries for more accurate computations, while smoothness is implicit in the elliptic equations. The approach allows multiple-block grid systems to be constructed to treat complex configurations as well. The solution-adaptive computational procedure has been accomplished by coupling the elliptic grid generation technique with an implicit, finite volume, upwind Euler flow solver. In simulating transonic fluid flow around a finned body of revolution and a multiple store configuration, the grid systems adapt to pressure gradients in the flow field. Results obtained show that the technique is capable of generating grid networks proper for the simulations of aerodynamics around complex configurations. Keywords: Computational fluid dynamics, Euler equations. (kr).
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Category :
Languages : en
Pages : 12
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Author: Terry L. Holst
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ISBN:
Category :
Languages : en
Pages : 13
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Category : Aeronautics
Languages : en
Pages : 1190
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