AnyLogic animates all flowcharts at model runtime. The basic color scheme for most of the Fluid Library blocks in the model window includes three colors (silver, purple and navy) to distinguish the current state of the block:
FluidSource,
FluidSplit, 
FluidConvert, 
Valve)
have zero
capacity and simply route the fluid
flow. Other blocks (e.g. 
Tank, 
Pipeline,
AgentToFluid, 
FluidPickup) have non-zero capacity
and can store some amount of fluid.
By default all blocks are colored as follows:
| Silver |  |
Denotes that the block has not received any fluid yet. |
| Purple |  |
Denotes that the block has received fluid but is currently empty and does not contain fluid. |
| Navy |  |
For zero capacity blocks, denotes that the block is part of the fluid flow. For non-zero capacity blocks, denotes that the block is filled to its full capacity. |
The color scheme for the non-zero capacity blocks reflects the currently contained fluid level:
| purple with navy |  |
Denotes that the block is partially filled. The fluid level is reflected by the navy bar size. |
Blocks become navy-colored on receiving a default batch of fluid.
A batch, however, can have an arbitrary color associated with it. If the Show batches in flowchart option is selected for a block, it will be colored according to the color of the batch currently contained in it:
FluidMerge and FluidSplit. In the priority mode, the dot indicating the priority input
becomes orange in case the flow values are not in accordance with the
priorities. This may well be a normal situation, but it also may signal
that the flows are distributed not in the desired way and that setting
custom priorities is required.