Anyone who knows the topic properly? Can offer fg for help of course


Porogramme need to have a possibility of determining the:
-density and viscosity of fluid
-diameter and density of ball
-step size (h)
-number of steps (integration time)

Buit firstly have to be done for free falling ball in a vacuum. I know i have to use the Runge Kutta 4th order solution method. Started and got this at teh moment:

Falling in vacuum:
m*(dV/dt) = m*g
V = V(initial) + g * t
Z = Z(initial) + V(initial) *t + (g*t^2)/2

where g works as our acceleration. so after differentiation:

dV/dt = d^2 Z/dt^2

then i have to add forces that affacets the body during motion:
bouyant force according to Archimedes principle,
force due to body acceleration,
forces due to viscous drag and shape drag


Can send you whole materials if theres anyone who can solve that problem and write in c++ or at least gimme some thoughts, Never made anything like that and that's the problem xP

Can offer 2000 fg if somebody will make this whole problem properly

bump

First get all the formulas you need. Figure out the physics of it and how to solve the problem on paper before you start writing any code.

Once you know all of that, doing something like this in C++ is pretty trivial. A small console app that takes all the variables as inputs and then does the math according to your formulas and prints output.

Thank you for the answer. Will try to finish math/physics tommorow and post results.

and use this equation for drag force
http://en.wikipedia.org/wiki/Drag_%28physics%29

no idea what you mean by body acceleration

"bouyant force according to Archimedes principle"
assume fully submerged to start, buoyant force is constant. otherwise, a lot more difficult

This post was edited by saber_x3 on Apr 8 2015 12:12am