Timeline for Is there a mathematical formula to calculate drag force without empirical testing?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 18, 2020 at 9:00 | history | tweeted | twitter.com/StackSpaceExp/status/1306880659223441408 | ||
| Sep 18, 2020 at 8:56 | comment | added | Heopps | Simulating single molecule colliding with the surface of moving object - for very very rarified air maybe it can work, I'd like to know the answer myself. But for dense enough atmosphere we just can't use this approach. The reason is a molecule bounced from moving object will immediately collide with another molecules and exchange its energy, these molecules will transfer it further and so on. As result in macroscopic level we will have pressure waves around the moving object and the interplay of these waves will define the drag, the lifting force, etc. | |
| Sep 18, 2020 at 7:19 | history | became hot network question | |||
| Sep 18, 2020 at 6:05 | answer | added | Paul | timeline score: 7 | |
| Sep 17, 2020 at 21:32 | comment | added | Organic Marble | "It is easy to do CFD, but difficult to do good CFD." bravo! | |
| Sep 17, 2020 at 19:22 | comment | added | William R. Ebenezer | Something close to what you ask is what can be done in simulations. Ansys Fluent, among several other CFD software, can be used to get almost every parameter you are looking for in the flow. These simulations require an in-depth understanding of various mathematical models of the fluid. It is easy to do CFD, but difficult to do good CFD. It is basically just the computer solving equations in iterations, and it remains your responsibility to tell it which ones are the best to use for your scenario. | |
| Sep 17, 2020 at 18:51 | answer | added | Russell Borogove | timeline score: 14 | |
| Sep 17, 2020 at 18:39 | answer | added | user21103 | timeline score: 8 | |
| Sep 17, 2020 at 18:35 | review | First posts | |||
| Sep 17, 2020 at 19:23 | |||||
| Sep 17, 2020 at 18:31 | history | asked | Xi Liu | CC BY-SA 4.0 |