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Terminal Falling Velocity of a sand garin (tutorial)

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Hi everyone...

Could someone please explain me why you add the GLOBAL VARIABLE X : X t - Xdo t. ?

The physics of the problem only state the necesity to establish the equation

Xdo t: Xdo tt-(F_z+F_g)/m_grain.,

which corresponds to the Ordinary Differential Equation:

(m_grain) * (Xdo tt) = (F_g+ F_z)

or

(F_g+ F_z)/(m_grain) - (Xdo tt) = 0 ; as is supossed to be entered in the software

The systems uses cylindrical coordinates so there is no conflict in x,y,z,t or X,Y,Z,T.

Thanks for your help on beforehand

Kind regards


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