Imagen de portada para Computation and Comparison of Efficient Turbulence Models for Aeronautics - European Research Project ETMA
Computation and Comparison of Efficient Turbulence Models for Aeronautics - European Research Project ETMA
Título:
Computation and Comparison of Efficient Turbulence Models for Aeronautics - European Research Project ETMA
ISBN:
9783322898593
Edición:
1st ed. 1998.
PRODUCTION_INFO:
Wiesbaden : Vieweg+Teubner Verlag : Imprint: Vieweg+Teubner Verlag, 1998.
Descripción física:
XIV, 581 p. 385 illus. online resource.
Serie:
Notes on Numerical Fluid Mechanics ; 5
Contenido:
1: Mixing Layers -- Test Case 1: supersonic mixing layers -- Numerical simulation and modeling of an unsteady supersonic mixing-layer flow -- A modified k-? model derived by homogenization techniques -- Compressibility models applied to supersonic mixing layers -- Numerical simulation of supersonic mixing layers at different convective Mach numbers with a k-? model -- Supersonic mixing layer -- Synthesis on compressible mixing layers -- 2: Compressible Back-Step Flow -- The supersonic flow over an axisymmetric rearward facing step Synthesis of results -- Computation of an axisymmetric supersonic back-step flow using a pointwise k-k2/? turbulence model -- Supersonic rearward-facing step calculations using an explicit fractional-step method and a two-equation turbulence model -- 3: Incompressible Wall Flows with Separation -- Presentation of test cases TC-2A TC-2B TC-2C TC-2D two-dimensional incompressible wall flows with separation -- Incompressible recirculating flows, TC2-A low-Re backward-facing step, TC2-B high-Re backward-facing step -- Computational results on test cases TC-2C and TC-2D two dimensional, incompressible flows with recirculation -- Incompressible recirculating flows, TC-2C fence-on-a- wall, TC-2D obstacle-in-channel -- Numerical solution of the turbulent flow over a fence using two equation models -- Computations of separating and reattaching flows with high- and low-Reynolds-number second moment closure -- Incompressible recirculating flows, a critical comparison of computations for low-and~high-Reynolds number flow over a backward-facing step -- Synthesis of test cases TC-2C and TC-2D, two dimensional, incompressible flow past wall-mounted obstacles -- 4: Flows Past a Flat Plate -- Specification of test case TC3 flat plate boundary layers -- A numerical evaluation of a new algebraic turbulence model -- Flat plate boundary layers -- Application of turbulence models to incompressible boundary layers in aeronautics -- The Samuel-Joubert test case, computed by a boundary-layer method -- Application of the finite element method to the Reynolds-averaged Navier-Stokes equations -- Simulations of compresible turbulent boundary layer using a low Reynolds k-? model -- Solutions of non-equilibrium wall boundary layers with a low-Reynolds-number second moment closure -- Synthesis on test case TC3 ETMA workshop, flate plate boundary layers -- 5: Shock Reflection -- ETMA test case 6au]shock reflection on a flat plate: description of the test case -- Numerical simulation of shock reflection with a compressible k-? model -- Simulations of shock reflection on flat plate using a low-Reynolds k-? model -- Assessment of a one-equation pointwise turbulence model for compressible flow - test case TC6 -- ETMA test case 6, shock reflection on a flat plate: synthesis of the calculations -- 6: Ramp Flow -- Supersonic compression ramp flow: synthesis of results -- Study of the supersonic compression ramp flow using the k-? turbulence model with and without algebraic Reynolds stress modifications -- Numerical simulation of compression ramp flows with a compressible k-? model -- Computation of a shock-wave boundary-layer interaction on compression ramp flow configuration -- The shock/turbulent boundary layer interaction over the Princeton 20° and 24° ramps -- Computations on the compression ramp using explicit algebraic Reynolds stress models -- Numerical simulation of a 24° compression ramp by a k-? model with compressibility terms -- 7: Flow Over a Bump -- Test case TC5: two dimensional transonic bump -- Assessment of a one-equation pointwise turbulence model for compressible flow -- Numerical simulation of the flow over a 2D transonic bump with extended separation -- Calculation of a two dimensional transonic bump with a multiple-time-scale turbulence model -- Computation of a two dimensional transonic bump flow using a point wise k-k2/? turbulence model -- Extension of an incompressible algorithm for compressible flow calculations: validation on a transonic flow in a bump -- Computation of a shock wave boundary layer interaction in a nozzle with different anisotropic turbulence models -- 2-D transonic bump flow calculations using an explicit fractional-step method -- Computations on the transonic bump using explicit algebraic Reynolds stress models -- TC5 synthesis -- 8: Steady Airfoil Flow -- Presentation of TC8: flow around airfoil (steady) -- Transonic Navier-Stokes computations on unstructured grids using a differential Reynolds stress model -- Implicit multigrid computations of an airfoil flow -- Unstructured grid solutions using k-? with wall functions -- The Dornier 2D Navier-Stokes approach applied to transonic airfoil flow -- Flow calculations past RAE 2822 and MBB-A3 airfoils for the ETMA workshop using the Navier-Stokes code ARC2D -- Calculation of the RAE2822 transonic airfoil using the k-? model -- Application of an unstructured grid flow solver to compressible turbulent flows -- 9: Unsteady Airfoil Flow -- Presentation of the test-case TC8bis -- rediction of the unsteady transonic turbulent flow around a circular-arc aerofoil -- Unsteady separated turbulent flows computation with wall-laws and k-? model -- Unsteady flow over a circular arc airfoil -- Synthesis on the unsteady transonic flow around a circular-arc aerofoil (TC8bis) -- Elements Of Synthesis and Conclusion -- Elements Of Synthesis and Conclusion.
Síntesis:
The computation of complex turbulent flows by statistical modelling has already a long history. The most popular two-equation models today were introduced in the early sev­ enties. However these models have been generally tested in rather academic cases. The develope­ ment of computers has led to more and more acurate numerical methods. The interactions betwe~n numerical and modelling techniques are generally not well mastered. Moreover, computation of real life cases, including 3D effects, complex geometries and pressure gra­ dients based on two-equation models with low-Reynolds treatment at the proximity of walls are not really of common use. A large number of models has been proposed; this is perhaps the sign that none of them is really satisfactory, and then the assessment of their generality is not an easy task: it requires a lot of understanding of the physics and a lot of work for testing the large number of relevant cases in order to assess their limits of validity which is a condition for an improved confidence in engineering applications. This is probably why workshops and working groups are frequent and the ETMA consor­ tium has choosen to build a state of the art in theoretical and numerical statistical turbu­ lence modelling for real life computations by taking some marks with respect to previous workshops such as the Stanford meetings (1980,1981); some problems are kept or updated by new experiments, some problems are discarded, some new problems are introduced; the focus is kept on flows with 2D geometries.
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Idioma:
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