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CFD Fish Passage Simulation A computer simulation showing the effectiveness of different baffle types in a round culvert.

CFD Software

We simulated 3 different types of baffles in a typical round culvert.

(Click any of the smaller images to enlarge)

  • 1600mm diameter culvert
  • Flow rate: 1 Lt/s
  • Gradient/Slope: 1%
Type 1 Spoiler Baffles (Blocks)
Type 3 Spoiler Baffles (Cubes)
Flexible Baffles

First, here is the culvert with no baffles installed.

Watch what happens to the water when Type 1 Spoiler Baffles have been installed.

Now watch what happens to the water when Type 3 Spoiler baffles have been installed.

Now watch what happens to the water when Flexi-baffles have been installed.

Now let's look at some side-by-side comparisons.

Let's start with velocity.

Let's look at water depth.

This slide shows that only flexible baffles have a good amount of depth and low velocity in the same place.

These slides show the velocities down through the water column.

Now let's look at some real-life examples.

Here is some old footage we've found of baffles in a similar culvert and is remarkably similar to the CFD simulations.

(Click to enlarge)

Graphs

These graphs show the water velocity below 0.3m/s at different depths

This graph shows the overall depth.

The end.

Fish Passage Action Team

Created By
Alexandra Johnson-Hughes
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