Simulate following vehicles¶

Bramble can add copies of the model at set offsets from the lead vehicle, so each Attitude simulates a car following another. You set the offsets in the Map.

Add the following vehicles to the Map¶

1. Open the Map editor: create a Map or edit an existing one.
2. In the Following Vehicles section, tick Use Following Vehicles.

3. For each following vehicle, fill in a row of the table. Click Add to add another.

   Field	Enter
   Number	The vehicle's number
   Longitudinal Offset	The distance along the domain's x-axis from the lead vehicle, in m
   Lateral Offset	The distance along the y-axis, in m

   Both offsets are required and default to 0. The last row can't be deleted ("Can not delete the last following vehicle"). To remove every following vehicle, untick Use Following Vehicles.

4. Click Save.

The same offsets apply to every Attitude in the Map.

What Bramble does¶

When the case is created, Bramble:

• copies the whole model to each offset, and extends the domain and ground patch to fit
• copies the monitors, exports, convergence criteria and components, such as radiators and wheels, for each following vehicle
• if the Attitude has a Corner Radius, places the following vehicles round the corner's arc instead of in a straight line. See simulate cornering

Results¶

• Each following vehicle's forces and monitors are recorded separately from the lead vehicle's.
• On the Results page, Delta to Lead Case shows the following vehicles' results as deltas to the lead.
• The CFD Setup tab doesn't list the following vehicles. They use the lead Attitude's setup.

Related: Create a Map · Simulate cornering · CFD setup options · Simulation configuration