Skip to main content Accessibility help
×
Hostname: page-component-7c8c6479df-7qhmt Total loading time: 0 Render date: 2024-03-28T23:59:28.216Z Has data issue: false hasContentIssue false

7 - Simplified schemes

Published online by Cambridge University Press:  05 November 2012

Kemal Hanjalić
Affiliation:
Technische Universiteit Delft, The Netherlands
Brian Launder
Affiliation:
University of Manchester
Get access

Summary

Rationale and organization

Models for the turbulent stresses and scalar fluxes have been in widespread use since the 1960s, incorporated within CFD codes of a wide range of types and capabilities. Over this period the vast majority of computations have been made using turbulence models simpler than second-moment closure. Quite clearly, such simpler models must deliver satisfactory predictions of some of the flows of interest – for otherwise they would be discarded. This chapter is devoted to such reduced models. The position adopted is that, of course, such simplification makes sense, provided it is made with an appreciation of what has been lost in the process.

This truism applies as much to the numerical solver as to the physical model of turbulence employed, for one would surely never use a three-dimensional, elliptic, compressible-flow solver if one's interests were simply in computing a range of axisymmetric, unseparating boundary layers in liquids. But, if we proceed in the reverse direction, while it is not usually possible to apply a simple numerical solver to flows well beyond the solver's capability, it is all too easy to assume that a turbulence model that functioned very satisfactorily in computing simple shear flows, will perform equally as well in computing complex strains or in the presence of strong external force fields. That is why it is seen as important that simple (or simpler) turbulence models should be arrived at by a rational simplification of the full second-moment closure (having regard for the particular features of the flow to be computed) rather than by adopting some constitutive equation as an article of faith.

Type
Chapter
Information
Modelling Turbulence in Engineering and the Environment
Second-Moment Routes to Closure
, pp. 240 - 312
Publisher: Cambridge University Press
Print publication year: 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1983

Save book to Kindle

To save this book to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

  • Simplified schemes
  • Kemal Hanjalić, Technische Universiteit Delft, The Netherlands, Brian Launder, University of Manchester
  • Book: Modelling Turbulence in Engineering and the Environment
  • Online publication: 05 November 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9781139013314.009
Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

  • Simplified schemes
  • Kemal Hanjalić, Technische Universiteit Delft, The Netherlands, Brian Launder, University of Manchester
  • Book: Modelling Turbulence in Engineering and the Environment
  • Online publication: 05 November 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9781139013314.009
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Simplified schemes
  • Kemal Hanjalić, Technische Universiteit Delft, The Netherlands, Brian Launder, University of Manchester
  • Book: Modelling Turbulence in Engineering and the Environment
  • Online publication: 05 November 2012
  • Chapter DOI: https://doi.org/10.1017/CBO9781139013314.009
Available formats
×