SIMVehiclesSubmodules
Aerodynamics submodule
Use aerodynamic parameters to model drag, lift, ride-height dependency, speed dependency, and yaw dependency for a vehicle setup.
Aerodynamics define the drag and lift model used by SIM. Use this submodule when a vehicle setup needs aero coefficients, ride-height maps, or speed and yaw corrections.
When to use it
Use aerodynamics when you need a reusable setup building block that can be selected in a vehicle assembly. Create and maintain it from Design > Aerodynamics, then select it in the vehicle slot Aerodynamics.
How it fits vehicle setup
- Create or duplicate the submodule from the Design section.
- Open the submodule row to review and edit parameter values.
- Save changes with Update Data.
- Open Vehicles and select the submodule in Vehicle Assembly.
- Use the vehicle detail tabs to inspect the selected submodule inside the vehicle context.
You need module create permission to create a new submodule and module update permission to edit values.
Parameter reference
Units, defaults, and ranges show n/a when no stable user-facing value was verified in the source used for this page. Method rows control which constant, lookup table, or polynomial rows are active in the product table.
General
| Parameter | Description | Units | Default | Validation / Range |
|---|---|---|---|---|
| Frontal Area | The cross sectional area of the car seen from the front. | m² | n/a | n/a |
| Cd Offset | A possibility to offset the aerodynamic drag coefficient (for example from different wing settings or other add-on features like blanking etc). This offset will be applied on all of the various options that are available to define the aerodynamic drag coefficient (constant, lookup table or polynomial). | n/a | n/a | n/a |
| Clf Offset | A possibility to offset the aerodynamic lift coefficient for the front axle (for example from different wing settings or other add-on features like blanking etc). This offset will be applied on all of the various options that are available to define the aerodynamic lift coefficient (constant, lookup table or polynomial). | n/a | n/a | n/a |
| Clr Offset | A possibility to offset the aerodynamic lift coefficient for the rear axle (for example from different wing settings or other add-on features like blanking etc). This offset will be applied on all of the various options that are available to define the aerodynamic lift coefficient (constant, lookup table or polynomial). | n/a | n/a | n/a |
Ride height dependency
| Parameter | Description | Units | Default | Validation / Range |
|---|---|---|---|---|
| Method | The selector that defines if aerodynamic forces shall be calculated by the simple constant values or by the more detailed aero map lookup tables or by the two dimensional polynomial functions. | n/a | n/a | Selects active input method |
| Cd Constant | The constant value for aerodynamic drag. Always a positive value. | n/a | n/a | Visible when method = Constant |
| Clf Constant | The constant value for aerodynamic lift on the front axle. A positive value means that the car will have less load on the front axle with increasing vehicle speed. A car with "downforce" will accordingly have a negative coefficient. | n/a | n/a | Visible when method = Constant |
| Clr Constant | The constant value for aerodynamic lift on the rear axle. A positive value means that the car will have less load on the rear axle with increasing vehicle speed. A car with "downforce" will accordingly have a negative coefficient. | n/a | n/a | Visible when method = Constant |
| Cd Lookup Table | Lookup table defining the aerodynamic drag coefficient vs ride height front and ride height rear. Always a positive value. | n/a | n/a | Visible when method = LookupTable |
| Clf Lookup Table | Lookup table defining the aerodynamic lift coefficient for the front axle vs ride height front and ride height rear. A positive value means that the car will have less load on the front axle with increasing vehicle speed. A car with "downforce" will accordingly have a negative coefficient. | n/a | n/a | Visible when method = LookupTable |
| Clr Lookup Table | Lookup table defining the aerodynamic lift coefficient for the rear axle vs ride height front and ride height rear. A positive value means that the car will have less load on the rear axle with increasing vehicle speed. A car with "downforce" will accordingly have a negative coefficient. | n/a | n/a | Visible when method = LookupTable |
| Cd Polynomial | Second order two dimensional polynomial coefficients to define the aerodynamic drag coefficient vs ride height front and ride height rear. Cd = c0 + c1 _ rideHeightFront + c2 _ rideHeightRear + c3 _ rideHeightFront _ rideHeightRear + c4 _ rideHeightFront^2 + c5 _ rideHeightRear^2 | n/a | n/a | Visible when method = Polynomial |
| Clf Polynomial | Second order two dimensional polynomial coefficients to define the aerodynamic lift coefficient for the front axle vs ride height front and ride height rear. Clf = c0 + c1 _ rideHeightFront + c2 _ rideHeightRear + c3 _ rideHeightFront _ rideHeightRear + c4 _ rideHeightFront^2 + c5 _ rideHeightRear^2 | n/a | n/a | Visible when method = Polynomial |
| Clr Polynomial | Second order two dimensional polynomial coefficients to define the aerodynamic lift coefficient for the rear axle vs ride height front and ride height rear. Clr = c0 + c1 _ rideHeightFront + c2 _ rideHeightRear + c3 _ rideHeightFront _ rideHeightRear + c4 _ rideHeightFront^2 + c5 _ rideHeightRear^2 | n/a | n/a | Visible when method = Polynomial |
Speed dependency
| Parameter | Description | Units | Default | Validation / Range |
|---|---|---|---|---|
| Cd Polynomial | Third order polynomial coefficients to define the aerodynamic drag variation dependent on vehicle speed. It is added to the aerodynamic drag coefficient defined by any of the methods; constant, lookup table or polynomial. CdDelta = c1 _ vehicleSpeed + c2 _ vehicleSpeed^2 + c3 * vehicleSpeed^3. | n/a | n/a | c0 fixed at 0 |
| Clf Polynomial | Third order polynomial coefficients to define the aerodynamic lift variation on the front axle dependent on vehicle speed. It is added to the aerodynamic lift coefficient for the front axle defined by any of the methods; constant, lookup table or polynomial. ClfDelta = c1 _ vehicleSpeed + c2 _ vehicleSpeed^2 + c3 * vehicleSpeed^3. | n/a | n/a | c0 fixed at 0 |
| Clr Polynomial | Third order polynomial coefficients to define the aerodynamic lift variation on the rear axle dependent on vehicle speed. It is added to the aerodynamic lift coefficient for the rear axle defined by any of the methods; constant, lookup table or polynomial. ClrDelta = c1 _ vehicleSpeed + c2 _ vehicleSpeed^2 + c3 * vehicleSpeed^3. | n/a | n/a | c0 fixed at 0 |
Yaw dependency
| Parameter | Description | Units | Default | Validation / Range |
|---|---|---|---|---|
| Cd Polynomial | Third order polynomial coefficients to define the aerodynamic drag variation dependent on vehicle yaw angle. It is added to the aerodynamic drag coefficient defined by any of the methods; constant, lookup table or polynomial. CdDelta = c1 _ vehicleYawAngle + c2 _ vehicleYawAngle^2 + c3 * vehicleYawAngle^3. | n/a | n/a | c0 fixed at 0 |
| Clf Polynomial | Third order polynomial coefficients to define the aerodynamic lift variation on the front axle dependent on vehicle yaw angle. It is added to the aerodynamic lift coefficient for the front axle defined by any of the methods; constant, lookup table or polynomial. ClfDelta = c1 _ vehicleYawAngle + c2 _ vehicleYawAngle^2 + c3 * vehicleYawAngle^3. | n/a | n/a | c0 fixed at 0 |
| Clr Polynomial | Third order polynomial coefficients to define the aerodynamic lift variation on the rear axle dependent on vehicle yaw angle. It is added to the aerodynamic lift coefficient for the rear axle defined by any of the methods; constant, lookup table or polynomial. ClrDelta = c1 _ vehicleYawAngle + c2 _ vehicleYawAngle^2 + c3 * vehicleYawAngle^3. | n/a | n/a | c0 fixed at 0 |