Talk:Fluid dynamics

From Wikipedia, the free encyclopedia

	Physics Portal This article is within the scope of WikiProject Physics, which collaborates on articles related to physics.
???	This article has not yet received a rating on the assessment scale. [FAQ]
???	This article has not yet received an importance rating within physics.
Help with this template Comments: edit – history – watch – refresh Version reviewed The first paragraph in the introduction is good but I am not so sure about the second Fluid dynamics offers a mathematical structure that underlies these practical disciplines and that embraces empirical and semi-empirical laws, derived from flow measurement, used to solve practical problems. What practical disciplines? Misses that the simplification aspect of fluid dynamics. Fluids are simply atoms with weak forces and fluid dynamics ignores single atoms and concentrates on bulk properties. How this works is incredible. Mentions quantum theory but not how that links with fluid dynamics. Some of the other sections are too technical. Could do with some more images. Covers most large sections of a very wide topic. Rex the first talk | contribs 14:32, 2 December 2006 (UTC)

	This article is within the scope of WikiProject Fluid dynamics, which collaborates on articles related to fluid dynamics.	Physics Portal
B	This article has been rated as B-Class on the assessment scale.
Top	This article is on a subject of top-importance within physics.
Help with this template Comments: edit – history – watch – refresh Version reviewed The first paragraph in the introduction is good but I am not so sure about the second Fluid dynamics offers a mathematical structure that underlies these practical disciplines and that embraces empirical and semi-empirical laws, derived from flow measurement, used to solve practical problems. What practical disciplines? Misses that the simplification aspect of fluid dynamics. Fluids are simply atoms with weak forces and fluid dynamics ignores single atoms and concentrates on bulk properties. How this works is incredible. Mentions quantum theory but not how that links with fluid dynamics. Some of the other sections are too technical. Could do with some more images. Covers most large sections of a very wide topic. Rex the first talk | contribs 14:32, 2 December 2006 (UTC)

Contents 1 Fluid mechanics vs. fluid dynamics vs. continuum mechanics 2 Fluidics 3 Continuity? 4 iw links 5 help 6 Where are the governing equations? 7 Citation of "Pope, 2000" 8 Other fundamental engineering topics

[edit] Fluid mechanics vs. fluid dynamics vs. continuum mechanics

I don't like the definition: "Fluid mechanics is a branch of continuum mechanics." Continuum fluid mechanics is only a subset of the entire field of fluid mechanics. Statistical mechanics, in which a fluid is not assumed to be a continuum, is even mentioned later in the paragraph. A dictionary defines fluid mechanics as: "a branch of mechanics dealing with the properties of liquids and gases." I think that in an encyclopedia this should described in further detail, maybe: "a branch of physics, or mechanics, dealing with the properties of liquids and gases, specifically with stationary fluids, hydrostatics, and fluids in motion, fluid dynamics. The study of fluid mechanics is dependant on the principles of conservation of mass (see continuity equation) and conservation of momentum (see Navier-Stokes equations,) and often relies on the study of thermodynamics. The object of the study of fluid mechanics is most often to calculate the forces exerted by a fluid flow (aerodynamics), to calculate the mass flow rate at a certain region within a fluid flow (pipes and plumbing), to describe the motion of a solid within a fluid (such as boat or an airplane wing,) to describe the noise generated by or propagating through a fluid, or even to describe the properties of a fluid." I would change the article myself, but I feel such a major change should be discussed. --Sean

Better, Thanks. -Sean

To me, fluid mechanics (or dynamics if you prefer) is a subset of continuum mechanics (which also includes elasticity). So, there'll be an inconsistency at one level or another no matter what you do. I don't have a strong opinion, otherwise. -- hike395 21:37, 31 Dec 2003 (UTC)

I think the problem is in the way of defining the concept of "fluid". If you define "fluid" as "liquids and gases" you're in troubles. If you define "fluid" as a "continuum which is perfectly deformable..." Things are clear: liquids and gases are phases of matter and are studied by statistical mechanics; fluids are continuos media and are studied by fluid mechanics or dynamics (this alternative remains) --crodrigue1 29 Jun 2004

This is a GOOD idea, we could say something like "continuum which is perfectly deformable...", e.g. liquid and gases in usual conditions to be precise and clear to everybody. --achab 14:05, 15 November 2005 (UTC)

To be precise, the definition of a fluid is a substance which deforms continuously under the action of a shear force, however small. For clarity, both definitions could probably be given. -EndingPop 21:10, 28 February 2006 (UTC)

The term fluid dynamics is actually a subset of fluid mechanics. Whereas dynamics relates to motion, mechanics is a broader term that includes both dynamics and statics. So hydrostatics is not actually a subset of fluid dynamics, but it is a subset of fluid mechanics. Moreover, the course actually taught to undergraduate engineers is generally called fluid mechanics. Therefore, I'd like to change back the title. Unfortunately, Wikipedia is not letting me do so. Any suggestions, apart from involving an admin?COGDEN 02:46, Nov 5, 2004 (UTC)

I'd agree: I think Fluid Mechanics should redirect to Fluid mechanics instead of this article.

Actually, I created a separate fluid mechanics page.COGDEN 20:52, Nov 13, 2004 (UTC)

I meant have Fluid Mechanics redirect to fluid mechanics instead of fluid dynamics - Reubot

Alright I've changed the redirect, also COGDEN, you might want to have a look at this Wikipedia:WikiProject Fluid dynamics/Top_draft - Reubot

[edit] Fluidics

Michael Hardy suggested: The material at fluidics should be incorporated into this article, and then that page should be redirected to this one.

About incorporation of Fluidics into Fluid dynamics: it is hardly advisable IMO. Modern usage of the term fluidics indicates that it differs from Fluid dynamics like, say electronics from Electromagnetism: fluidics is about control devices based on fluid dynamics. Mikkalai 19:43, 7 Sep 2004 (UTC)

Agreed. A more appropriate solution is to expand the stub entry on fluidics into a complete standalone article. Kaszeta 20:36, 7 Sep 2004 (UTC)

[edit] Continuity?

Any particular reason that the continuum assumption is being called "the continuity assumption"? I've always heard it referred to as a "continuum assumption" or "continuum approximation."

Continuity refers to the conservation of mass control volume equation, so it should not be used to mean a continuum specifically so we can avoid ambiguity. - EndingPop

[edit] iw links

I tried to sort out the iw links in fluid dynamics and fluid mechanics. It's very confusing because some wikipedias have only one article for both concepts, while others have separate articles. Someone could clear this up... -Easlak 08:11, 10 November 2005 (UTC)

[edit] help

ok i need help which shape best travels through water?

a Streamlined shape.

[edit] Where are the governing equations?

Is there any page regarding governing equations of fluid dynamics (continuity, momentum, energy)? I would love to add some basic definitions if there is none. Cheers, MrMo 10:59, 30 December 2005 (UTC)

There's a whole section on the governing equations, which points to Navier-Stokes equations -- Kaszeta 14:01, 30 December 2005 (UTC)

[edit] Citation of "Pope, 2000"

Could someone who knows the reference matieral please properly cite this source. I can't find any materials published by (I'm assuming Alan) Pope in 2000. The closest I can find is "Low-speed wind tunnel testing" from 1999. --Ig0r 22:11, 21 August 2006 (UTC)

[edit] Other fundamental engineering topics

Why is there a separate section for Fluid dynamics#Other fundamental engineering topics? It would be better to make a template for those topics. -- Myth (Talk) 05:42, 9 March 2007 (UTC)