# motion of a fluid in a moving truck

I am into a project that simulates a moving truck with a tank holding water inside it, this is example (https://www.youtube.com/watch?v=jqpl4ME6rRY).

I studied the mechanics of the motion of the truck, and the motion of the water inside a static tank.
the problem is the mutual influence between the motion of the fluid and the motion of the truck. so there are two main problems I am stuck with:

1. the influence of the motion of the truck to the motion of the fluid inside it.
2. the influence of the motion of the fluid to the motion of the truck.

You can suppose that the truck moves in a straight line parallel to X-axes, with left and right move only.

for problem 1, as I am using SPH method to simulate the liquid, I am thinking of add the acceleration of the truck to the SPH equation for every fluid particle, I am not sure about it..

for problem 2, maybe I should compute the pressure force effecting to free surfaces of the truck (getting them from the pressure force of the particles) then add it to the acceleration of the truck, I am not sure also..

I hope my ideas to be correct and to share yours with me. Thank you.

• How complex/accurate do you want your model to be? Will you be modelling only static cases, i.e. constant acceleration, or do you want to study the dynamics the the truck changes its acceleration? Dec 14 '16 at 13:27
• The second one, the dynamic cases Dec 14 '16 at 14:19
• What is SPH? This is not a standard term in physics. I presume you mean Smoothed Particle Hydrodynamics? Dec 14 '16 at 20:25
• Yes I mean Smoothed-particle_hydrodynamics. Dec 14 '16 at 20:51