Book contents
- Frontmatter
- Brief Contents
- Contents
- Preface
- 1 The Finite Element Method: Introductory Remarks
- 2 Some Methods for Solving Continuum Problems
- 3 Variational Approach
- 4 Requirements for the Interpolation Functions
- 5 Heat Transfer Applications
- 6 One-Dimensional Steady-State Problems
- 7 The Two-Dimensional Heat-Conduction Problem
- 8 Three-Dimensional Heat-Conduction Applications with Convection and Internal Heat Absorption
- 9 One-Dimensional Transient Problems
- 10 Fluid Mechanics Finite Element Applications
- 11 Use of Nodeless Degrees of Freedom
- 12 Finite Element Analysis in Curvilinear Coordinate
- 13 Finite Element Modeling of Flow in Annular Axisymmetric Passages
- 14 Extracting the Finite Element Domain from a Larger Flow System
- 15 Finite Element Application to Unsteady Flow Problems
- 16 Finite Element-Based Perturbation Approach to Unsteady Flow Problems
- Appendix A Natural Coordinates for Three-Dimensional Surface Elements
- Appendix B Classification and Finite Element Formulation of Viscous Flow Problems
- Appendix C Numerical Integration
- Appendix D Finite Element-Based Perturbation Analysis: Formulation of the Zeroth-Order Flow Field
- Appendix E Displaced-Rotor Operation: Perturbation Analysis
- Appendix F Rigorous Adaptation to Compressible-Flow Problems
- Index
- References
12 - Finite Element Analysis in Curvilinear Coordinate
Published online by Cambridge University Press: 05 June 2014
- Frontmatter
- Brief Contents
- Contents
- Preface
- 1 The Finite Element Method: Introductory Remarks
- 2 Some Methods for Solving Continuum Problems
- 3 Variational Approach
- 4 Requirements for the Interpolation Functions
- 5 Heat Transfer Applications
- 6 One-Dimensional Steady-State Problems
- 7 The Two-Dimensional Heat-Conduction Problem
- 8 Three-Dimensional Heat-Conduction Applications with Convection and Internal Heat Absorption
- 9 One-Dimensional Transient Problems
- 10 Fluid Mechanics Finite Element Applications
- 11 Use of Nodeless Degrees of Freedom
- 12 Finite Element Analysis in Curvilinear Coordinate
- 13 Finite Element Modeling of Flow in Annular Axisymmetric Passages
- 14 Extracting the Finite Element Domain from a Larger Flow System
- 15 Finite Element Application to Unsteady Flow Problems
- 16 Finite Element-Based Perturbation Approach to Unsteady Flow Problems
- Appendix A Natural Coordinates for Three-Dimensional Surface Elements
- Appendix B Classification and Finite Element Formulation of Viscous Flow Problems
- Appendix C Numerical Integration
- Appendix D Finite Element-Based Perturbation Analysis: Formulation of the Zeroth-Order Flow Field
- Appendix E Displaced-Rotor Operation: Perturbation Analysis
- Appendix F Rigorous Adaptation to Compressible-Flow Problems
- Index
- References
Summary
In this chapter we apply Galerkin's weighted-residual finite element approach to a special category of flow problems. This is where only the through-flow and tangential momentum equations (beside the continuity equations, of course) suffice as the flow-governing equations. This problem is perhaps best represented by the socalled quasi-three-dimensional flow field in analyzing airfoil cascades. Some terms within the finite element formulation are presented and modeled as “source” terms, in analogy with a special problem category in heat conduction. Also, implicit means are used in enforcing the cascade periodicity conditions.
Introduction
In the cascade theory discipline, the basic problem is that of a three-dimensional periodic flow in the blade-to-blade hub-to-casing passage (Figure 12.1). In modeling this flow type, it is crucial to account for such real-flow effects as boundary layer separation, flow recirculation, and trailing-edge mixing losses. Existing numerical models in this area vary in complexity from the potential flow category [1–3] to that of the fully three-dimensional viscous flow field [4, 5]. Compared with the strictly two-dimensional and three-dimensional flow models, the quasi-three-dimensional approach (which is the topic in this chapter) to the cascade flow problem has been recognized as a sensible compromise in terms of both economy and precision. It is, however, the viscous flow version of the problem, under this approach, that is in need of further enhancement, particularly in the area of simulating the hubto-casing flow interaction effects on the blade-to-blade flow field.
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- Publisher: Cambridge University PressPrint publication year: 2013