Talk:Computational fluid dynamics/Archive 1: Difference between revisions

Revision as of 00:52, 28 November 2021

Latest revision as of 00:55, 28 February 2023

Line 70:

::As I mentioned above, if someone is making a comprehensive list it should be a [[Wikipedia:Lists|Wikipedia list article]]. The codes mentioned in the CFD article should only be those significant in the history of CFD (for example, the first commerical CFD code). --[[User:Charlesreid1|Charlesreid1]] ([[User talk:Charlesreid1|talk]]) 00:07, 5 November 2010 (UTC)

== Problems with the article==

Why is there not any mention of LES(large eddy simulation) or DNS(direct numerical simulation) '''(fixed)'''

More importantly, what about Langrangian Techniques? Don't you think that Lagrangian and Euler based methods deserve a say in this article?

I think that there should be an introduction to the difference between the Lagrangian and Eulerian approach and how Lagrangian ones are better suited to handle interactions with rigid bodies (that are usually modelled with a Lagrangian approach). Lagrangian-Eulerian methods are also used widely in the field of CFD for computer graphics, where the main problem is the fluid-solid (and vice-versa) interaction and the free surface between the fluid and the air (that's the visible part of fluid flow, so it's important for CG). Maybe a reference to the level-set method is also needed as it is a link to this book http://www.cambridge.org/us/catalogue/catalogue.asp?isbn=0521853109

''Added 5/1/2005'' I've cleaned the article up a bit, and pointed out the key issues with regard to discretization at the very beginning. [[User:Rtfisher]]

In the article it says, "While it is possible to directly solve the Navier-Stokes equations for laminar flow cases, turbulent flows require the introduction of a turbulence model."

This is not true since DNS does not use any turbulence model, although it solves the Navier-Stokes equations directly.

"Boundary conditions are defined. This involves specifying the fluid behaviour and properties at the boundaries of the problem. For transient problems, the initial conditions are also defined"

This is not true since initial conditions are specified for steady-state problems as well. In steady state problems, the solution evolves from the intial guess to the final steady state solution.<!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/134.117.175.33|134.117.175.33]] ([[User talk:134.117.175.33#top|talk]]) 05:21, 17 November 2004 (UTC)</small>

:In that case it isn't an initial condition, it's an initial guess. By definition, initial conditions are the conditions for when the time coordinate is equal to zero. If there is no time coordinate, there cannot be initial conditions. So the statement is correct. --[[User:Charlesreid1|Charlesreid1]] ([[User talk:Charlesreid1|talk]]) 00:10, 5 November 2010 (UTC)

There is probably no mention of LES because because nobody felt competent to write it. It's not exactly a well-known subject. I worked in the field, and I'm not competent. Feel free to add what you know. [[Wikipedia:Be bold in editing|Be bold in editing]]. [[User:DJ Clayworth|DJ Clayworth]] 04:00, 18 Nov 2004 (UTC)

The "Boussinesq hypothesis" link that is included under the RANS subsection should refer to Boussinesq's assumption regarding a scalar eddy viscosity and not to his approximations regarding buoyancy-driven flows. [[User:129.22.149.57|129.22.149.57]] 20:38, 18 April 2007 (UTC)