So this is a little bit in too involved, but let me describe the way.
The first line is hydraulics simulation for a global network.
Here, input is node inflow Qn, so how much flow comes in from the node.
And then what we compute is pipe flow from node inflow.
And hydraulics is a simplified computational method directly computed
from compute from node inflow, and to get a pipe flow.
And after pipe flow, we can compute a pressure, pressure drop at this pipe.
And then from pipe pressure drop, we can
compute the node pressure inside of each node.
And you can get these all information by solving a linear global system once.
It's very fast and it's very efficient.
And after computing pressure node, and [UNKNOWN] pipe flow, we
now switch to our regional [INAUDIBLE] so for each local region.
We compute we divide into a lots of grid cells
like this one, and for each grade cell, we compute pressure
and velocity, and in order the compute individual pressure and velocity, we
use a very standard established fluid equation called Navier-Stokes Equation.
So this one is a little bit complicated, but
essentially this just explains the relationship with fluid velocity
and fluid pressure, you know, if there's a huge
difference in fluid pressure, and it causes velocity, and so.
And this step basically just solved this equation times
step, each time step on this grid cells inside each region, to get an animation.