Stanford University Unstructured (SU2): Analysis and Design Technology for Turbulent Flows

2014 ◽  
Author(s):  
Francisco Palacios ◽  
Thomas D. Economon ◽  
Aniket Aranake ◽  
Sean R. Copeland ◽  
Amrita K. Lonkar ◽  
...  
Keyword(s):  
Turbulent Flows ◽  
Stanford University ◽  
Design Technology ◽  
Analysis And Design

Requirements Analysis and Design Technology Report.

1994 ◽  
Author(s):  
Ralph Ganska ◽  
John Grotzky ◽  
Jack Rubinstein ◽  
Jim Van Buren ◽  
Shane Atkinson
Keyword(s):  
Requirements Analysis ◽  
Design Technology ◽  
Analysis And Design

Boundary Layer Calculation for Analysis and Design

1978 ◽  
Vol 100 (2) ◽  
pp. 232-236 ◽  
Author(s):  
H. E. Weber
Keyword(s):  
Boundary Layer ◽  
Pressure Gradient ◽  
Turbulent Flows ◽  
Free Stream ◽  
Cross Flow ◽  
Semiempirical Method ◽  
Stream Velocity ◽  
Potential Core ◽  
Analysis And Design ◽  
Inlet Conditions

A simple, semiempirical method for calculating the laminar, transition, and turbulent boundary layer with arbitrary free stream pressure gradient is developed. Good correlation is obtained with data on general two dimensional turbulent flows, diffuser flows, and the cylinder in cross-flow. However only for the diffuser has the boundary layer flow been coupled with the potential core so that only the inlet conditions and geometry are required. In other cases the free stream velocity distribution must be known or calculable. Skin friction coefficient, momentum thickness Reynolds number, and free stream pressure gradient parameter correlation employs a simple lag theory. With the integral momentum equation the complete boundary layer parameters are obtained as functions of the distance along a surface.

Evaluation of a 3D Viscous Code for Turbomachinery Flows

1997 ◽  
Author(s):  
W. John Calvert ◽  
Andrew W. Stapleton ◽  
Paul R. Emmerson ◽  
Cecil R. Buchanan ◽  
Christopher M. Nott
Keyword(s):  
Boundary Layer ◽  
Turbulent Flows ◽  
Strong Shock ◽  
Turbulence Models ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Complex Flows ◽  
Analysis And Design ◽  
Computational Fluid Dynamics Cfd ◽  
Wave Boundary

Computational Fluid Dynamics (CFD) codes play an increasingly important role in the design and development of turbomachinery for modern gas turbine engines. As a result additional emphasis is being placed on the evaluation of the codes to ensure that they are working correctly and to indicate the accuracy which is likely to be achieved in practice. At DERA a programme of work has been carried out to evaluate the TRANSCode 3D viscous flow code, which was developed from the BTOB3D solver written by Dawes in 1986. A three part strategy for the validation and calibration of the code was adopted, covering comparisons with boundary layer test cases, Q3D compressor cascades and full 3D cases. The results indicated that the grids currently employed for turbomachinery flows limit the accuracy achieved for cases where there is significant laminar flow. For turbulent flows the Baldwin-Lomax turbulence model gives reasonably accurate results for 2D flows in near equilibrium, but it is less satisfactory for more complex flows, when the concept of a simple 2D boundary layer does not apply, and for strong shock wave/boundary layer interactions. Overall it is considered that the code is a valuable tool for turbomachinery analysis and design, but solutions must be assessed with care. Alternative turbulence models and other developments are being pursued for future versions of the code.

Two-point closures and their applications: report on a workshop

2001 ◽  
Vol 436 ◽  
pp. 393-407 ◽  
Author(s):  
F. S. GODEFERD ◽  
C. CAMBON ◽  
J. F. SCOTT
Keyword(s):  
Turbulent Flows ◽  
Large Scale ◽  
Expert Knowledge ◽  
Local Equilibrium ◽  
Three Dimensional ◽  
Cascade Process ◽  
Satisfactory Description ◽  
Analysis And Design ◽  
Global Challenge ◽  
Wide Range

This international scientific workshop was organized in Lyon, France, from 10 to 12 May 2000. Its focus was ‘Two-point closures and their applications’, with the understanding that the analysis and design of such models requires expert knowledge coming from a wide range of areas in turbulence research, e.g. experiments, numerical simulations, asymptotic models, etc.In the global challenge of turbulence modelling, two-point closures prove useful in many ways. Two-point correlations and spectra are useful measures of the distortion of the eddy structure of turbulence by stratification, large-scale strains, rotation, etc. In some cases, e.g. near boundaries, spectra can be drastically changed. In addition to the accurate characterization of turbulence, the explicit computation of two-point correlations or spectra shows how the internal dynamics of the various scales of motion are affected by such distortion, especially the cascade process on which the production/dissipation relationship depends. Distortion can be the cause of large departures from isotropic homogeneous turbulence, pulling turbulent flows far away from the local equilibrium that is often assumed. A rather weak departure can allow the use of linearized theories such as rapid distortion theory, for the applicability of which rational bounds may be estimated by comparisons with weakly nonlinear calculations. A different approach is necessary when dealing with larger departures, for instance due to growth of instabilities. In that case new physical or similarity arguments have to be employed to obtain a satisfactory description of the modification to the cascade process, which can even undergo reversal in the limit when three-dimensional turbulence becomes two-dimensional. Of course, significant changes in spectra have direct implications for one-point measures of turbulence – which can be explicitly derived by integration of two-point correlations – used in most industrial closure schemes. Such one-point models consequently need to be adapted when turbulence is strongly affected by distortion.

scholarly journals Lagrangian Transport and Chaotic Advection in Three-Dimensional Laminar Flows

2021 ◽  
Author(s):  
Michel F. M. Speetjens ◽  
Guy Metcalfe ◽  
Murray Rudman
Keyword(s):  
Turbulent Flows ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Laminar Flows ◽  
Chaotic Advection ◽  
Systematic Analysis ◽  
Lagrangian Transport ◽  
Analysis And Design ◽  
Efficient Transport ◽  
Transport And Mixing

Abstract Transport and mixing of scalar quantities in fluid flows is ubiquitous in industry and Nature. Turbulent flows promote efficient transport and mixing by their inherent randomness. Laminar flows lack such a natural mixing mechanism and efficient transport is far more challenging. However, laminar flow is essential to many problems and insight into its transport characteristics of great importance. Laminar transport, arguably, is best described by the Lagrangian fluid motion ("advection") and the geometry, topology and coherence of fluid trajectories. Efficient laminar transport being equivalent to "chaotic advection" is a key finding of this approach. The Lagrangian framework enables systematic analysis and design of laminar flows. However, the gap between scientific insights into Lagrangian transport and technological applications is formidable primarily for two reasons. First, many studies concern two-dimensional (2D) flows yet the real world is three dimensional (3D). Second, Lagrangian transport is typically investigated for idealised flows yet practical relevance requires studies on realistic 3D flows. The present review aims to stimulate further development and utilisation of know-how on 3D Lagrangian transport and its dissemination to practice. To this end 3D practical flows are categorised into canonical problems. First, to expose the diversity of Lagrangian transport and create awareness of its broad relevance. Second, to enable knowledge transfer both within and between scientific disciplines. Third, to reconcile practical flows with fundamentals on Lagrangian transport and chaotic advection. This may be a first incentive to structurally integrate the "Lagrangian mindset" into the analysis and design of 3D practical flows.

The Philological Association of The Pacific Coast

PMLA ◽  
1935 ◽  
Vol 50 (4) ◽  
pp. 1373-1374
Keyword(s):  
Annual Meeting ◽  
Pacific Coast ◽  
Stanford University ◽  
The Pacific

The thirty-seventh annual meeting of the Philological Association of the Pacific Coast was held at Stanford University, California, on November 29 and 30, 1935.

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