Unreal Fluid Dynamics

Culvert at dike
To discharge water from island to sea
Pumping station with pipes
To discharge water from island to sea
Ditches
Discharge water to Pumping-station of culvert at dike
Weirs
To control waterlevel ditch
Culvert in ditch
When ditch has to cross road
Lakes / surface water
For storage of surplus of rainfall
Sewer pipe
Storage settling basin (BBB)

The dynamic water system on land is programmed as a blueprint.
FD_Surfacewater contains both the logic and the assets of the water system. The backbone of the FD_Surfacewater is a spline with points. The points represent a change in the water system, for example: input discharge, different structure (pipe, channel, weir..), different dimension. So each point (=Node) is connected with the database WaterSystemData. So in between 2 points (=branch) of the backbone spline, everything is the same, based on the information of the downstream point.. Spline and point represent the bedlevel of the structure.
Index 0 spline is downstream

Al the programming is done in the so called construction script. This is a cool feature of Unreal Engine. Al programmed calculations can be done in the editor. It is for example not necessary to run the game, to see what waterlevels will occur. They are already calculated in the editor.

Formulas used for calculation water levels

Some general Notes:

The basis of the watersystem is a spline. Between 2 nodes the structure is the same. The location of the spline is the bedlevel.
A FD_Surfacewater is one line with no branches and has a fixed direction of flow.
A dendritic system is possible, because the 3D world may contain different FD_Surfacewater which are connected at points. When calculation a dendritic system the sequence of making calculations is important.
Strategy for calculating the water-system.We assume a stationary flow. So new calculations are only made when changes are made to the water-system. In the future calculations will be made per time-step and change in storage will also be taken into account.
Link to page with formulas used
To get access to the information, or to change information menu are used.
Link to page Navigation
Internal Unreal uses centimeters, the
FD_Surfacewater uses m
Backbone of FD_Surfacewater is the WaterDataStruct which stores all data (also calculated data) for each branch.

Connect side branches

Information on side branch is stored in [ConnectionLeft] and/or [ConnectionRight]
In FD_GameMode: FD_WaterSystemsref and FD_WatersystemName. Note This does not work in constructionscript ? So it should be a separate function in the constructionscript.
New function Find_Side_Branches
Changed variable InputDischarge to a 2dvector. x = de input branch, y is the input from sidebranches

Design Manhole

Is not a separate branch, but is generated when 2 culvert pipes branches connect.
The check on manhole is made when type is culvert. If type_down also is a culvert, a manhole can be added.
Switch to add manhole is :
When diameter pipes is different, manhole is added automatically
When diameter pipes is the same, the following switch is used.
Slope X = 1 add manhole, Slope X = 0 no manhole
A Boolean variable Manhole is defined.
Manhole is always a rectangle, with max 4 pipes connected. So 2 other BP_watersytems could be connected to the manhole.
Alle dimensions in m
When function manhole is activated the following information is defined:
– bedlevel, based on 4 connections
– D1, D2 (left), D3, D4(right)
– Width manhole based on D1 and D4. Width = Max D1 / D3 + 0,6 m
– Length manhole based on D2 en D4. Length = Max D2 / D4 + 0,6 m
– Length manhole / 2 = reduction length (m)
– Surfacelevel is de highest surfacelevelworld of the 4 connections
Manhole is activated before the pipe is drawn. This because the reduction length
In de first version, side connections is not taken into account.
Information from the array is also necessary for the Reduction Length for ending and starting pipe.

Design weir

Exists of 3 parts, left – middle (=crest) – left
Width_Diameter_m.x = width weir.
Width_Diameter_m.y = width sides

Blueprints used:

Notes:

Pure function: Setting (tick) in function. No exec pins
Node Clamp. Setting the min and max of a number

Documentation:

Blueprint Node Reference

https://docs.unrealengine.com/latest/INT/Resources/Showcases/BlueprintExamples/index.html?utm_source=launcher&utm_medium=ue&utm_campaign=uelearn

Event Dispatchers

Saving a game to a file

Blueprint-Communication-and-You-1220373635
if statement = branch node
BSP pain causing volumes
damage automatisch in UE, gebruiken voor geld?
Node event any damage 25.14
Direct communication: cast to
reference get actors off class
BP Interface Editor!! 49.50
SphereReacebyChannel
1:02:06 right mouse Collapse to Macro!!!
Use only function is access outside the BP is necessary
In output you can change the sequence of output pins
1:06:31 Setting up which BP interface is received in the new BP
1:11:00 collision box with collision settings as fake door
1:13:00 show 3d widget!
1.34:00 event dispatchers
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