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24-Ruby IV
December 11, 2013
Solved

Water drop flight

  • December 11, 2013
  • 1 reply
  • 4467 views

Sorry, 1st or 2-d model is more correct?

The 1st is more understanding

See please Prime 2 sheet in attach.

WDF.png

Best answer by ValeryOchkov

Thanks, Alan!

One part from my new book "Thermal engineering studies with Mathcad":

The system of equations shown in Fig. 18.1 should be, of course, much more complicated. It should more carefully consider the velocity components along the horizontal and vertical directions and the most absolute value of the velocity drops of water. These nuances are discussed on the forum - http://communities.ptc.com/message/228797. But we can restrict and simplistic solution, taking into account that the spherical drop of water during the flight will be deformed, and then break into separate small droplets. Our simplified solution gives quite believable animation. And this is enough for the initial (qualitative) formulation of the problem.

ЗЫ

pipi.png

1 reply

19-Tanzanite
December 11, 2013

Valery Ochkov wrote:

Sorry, 1st or 2-d model is more correct?

Method 1 is incorrect. The drag must be calculated using the overall speed, and the result then resolved onto the x and y directions.

Alan

24-Ruby IV
December 11, 2013

AlanStevens wrote:

Valery Ochkov wrote:

Sorry, 1st or 2-d model is more correct?

Method 1 is incorrect. The drag must be calculated using the overall speed, and the result then resolved onto the x and y directions.

Alan

must or can? (only with x http://communities.ptc.com/videos/1699)

Model.png

I think both model are... not quit correct. Or?

19-Tanzanite
December 11, 2013

Valery Ochkov wrote:

must or can?

must.

See attached (in MC15 format) for explanation.

Alan

NB Where I've written "Total distance travelled" in the worksheet, I mean the distance between the start and end points.