Timeline for Definition of incompressible flow
Current License: CC BY-SA 3.0
16 events
| when toggle format | what | by | license | comment | |
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| May 11, 2013 at 17:12 | answer | added | Jan Blechta | timeline score: 1 | |
| Apr 22, 2013 at 0:48 | comment | added | hardmath♦ | Notwithstanding the excellent answers received here(!), the question (minus editorializing) is about mathematical modelling in continuum mechanics. While the methods there run parallel to computational modelling, it seems to me off-topic for SciComp.SE as computational methods are not invoked. Even with my bias to inclusion of edge cases (esp. in beta), I voted to close as off-topic. | |
| Apr 17, 2013 at 19:07 | comment | added | Geoff Oxberry | @JedBrown: Yes. The gist of my remark was to point out that "incompressible flow conditions" are quite common. To quote George Box, "All models are wrong. Some are useful." Incompressible flow happens to be a useful model to the point where saying "it does not exist in reality" doesn't make sense unless we're trying to be pedantic. | |
| Apr 17, 2013 at 8:40 | vote | accept | Shri | ||
| Apr 17, 2013 at 3:44 | comment | added | Jed Brown | @GeoffOxberry We seem to be saying the same thing: the material is accurately modeled as incompressible within a regime. The regime is implicit in many discussions, but we need that context to make the statement. | |
| Apr 16, 2013 at 22:11 | comment | added | Geoff Oxberry | @JedBrown: We talk about incompressible materials all the time in thermodynamics. The compressibility of water around room temperature is on the order of 1e-10 inverse Pascals up to around 100 MPa. A jet cutter can reach pressures of 700 MPa. Household plumbing and cooling water in chemical plants probably doesn't exceed 1 MPa, and I would be very surprised if it exceeded 10 MPa, because most plumbing in chemical plants is designed for velocities of 3-5 m/s, hence the qualifier "much of". Of course it's condition-dependent. | |
| Apr 16, 2013 at 21:35 | comment | added | Jed Brown | @GeoffOxberry The speed of sound in water is about 1.5 km/s. Water jets cutters have a nozzle velocity up to about 1 km/s, justifying a compressible formulation. It doesn't make sense to say that a material is incompressible; instead we can only say that it can be modeled as incompressible within a stated regime. | |
| Apr 16, 2013 at 16:55 | history | tweeted | twitter.com/#!/StackSciComp/status/324204520018153473 | ||
| Apr 16, 2013 at 16:54 | review | Close votes | |||
| Apr 29, 2013 at 3:01 | |||||
| Apr 16, 2013 at 15:43 | comment | added | Geoff Oxberry | "As all knows, incompressible flows doesn't exist in reality": unless we're being extremely pedantic, much of the water flowing through plumbing is incompressible, because isothermal liquids have extremely small compressibilities. | |
| Apr 16, 2013 at 15:15 | answer | added | Jed Brown | timeline score: 15 | |
| Apr 16, 2013 at 14:06 | answer | added | jadelord | timeline score: 3 | |
| Apr 16, 2013 at 14:04 | answer | added | Bill Barth | timeline score: 10 | |
| Apr 16, 2013 at 13:40 | answer | added | John Mousel | timeline score: 10 | |
| Apr 16, 2013 at 12:06 | review | First posts | |||
| Apr 24, 2013 at 10:25 | |||||
| Apr 16, 2013 at 11:48 | history | asked | Shri | CC BY-SA 3.0 |