Specified by 2 downforce and 1 drag coefficient

Printscreen of the LapSim GUI showing aero forces versus speed

The aerodynamics of the vehicle are specified by an overall drag and two downforce coefficients. One for the front and one for the rear axle.

In the simulation model, all coefficients are multiplied by the frontal area, the specific mass of air and subsequently half the square of speed to get to the actual aerodynamic forces.

Printscreen of the LapSim GUI showing aero edit options

In the aero menu, one choose that the aerodynamics are shown in aero efficiency in combination with total downforce and aero balance.

Shifting between either editing option give a good view whether the aeromap has a logical shape. It is for this reason that we plot the 3D graph, because it instantly makes clear whether the form of the characteristic is logical.

5 Splitter and 5 diffusor rideheights

5 front and 5 rear Rideheight points for aero map

One can make the aerodynamic coefficients ride height dependent by selecting this option on the GUI.

There are 5 ride height points for both the front and the rear axle (5 x 5 = 25 points).

The rideheight of these 5 individual rideheight points, can be adjusted that it suits your needs best.

Printscreen of the LapSim GUI showing aero map with reduced diffusor rideheight points

Reduce rideheight points

To improve the effort of editing, the amount of ride height points can be reduced to either 3 or 2 rideheight points per axle, with the list boxes below the car figure.

The points between the selected rideheight points are calculated by linear interpolation.

Printscreen of the LapSim GUI showing the selection of an aero point

Select an individual point

You can select a point of the aeromap by clicking in the 3D aeromap with your left mouse button.

The edit boxes will subsequently be updated to the selected point.

Printscreen of the LapSim GUI showing the moving of an aero point

Drag and drop to edit

The individual points of the aeromap can be adjusted by selecting an aero point with your left mouse button. Keep the mouse button engaged while moving the mouse. You will see the point shifting and the aero value will appear on the screen. Release the button to finish.

Part of the GUI where aero points can be edited

Shift complete figure

Furthermore one can change the average value, in order to shift the complete map vertically.

This can of course also be done, should you chose to select total downforce + lift balance, instead of specifying front and rear downforce coefficients.

Straightline simulation for aero balance

Results of straightline simulation, rideheights and aero balance

Within the aero menu, LapSim has a feature to calculate a straight line simulation in order to analyse the vehicle’s ride heights and aero balance with increasing speed.

The behaviour of the vehicle is of course strongly influenced by the chosen spring characteristics and static ride heights in combination with the ride height dependent aero.

One aeromap for all wing positions

Wing dependency offsets for front and rear downforce as well as drag, creating a 4D map

In a separate menu the influence of the rear wing angle on the overall aerodynamics can be specified. This menu is selected by pressing the button on right bottom of the GUI.

One specifies offset values compared to a reference rear wing angle. In the example the reference rear wing angle is 6 [°]). The edit boxes show the offsets for 9 [°] rear wing angle.

By specifying the rear wing offsets, a 4D Aeromap is created. Such a 4D aeromap enables wing variations in the setup variation menu, supplying a userfriendly and thorough preparation for a race weekend.

Enables DRS simulation

Comparison of simulation lap with or without DRS enabled

Because the influence of the rear wing angle on the aerodynamics is specified, LapSim can simulate the influence of DRS.

The threshold when DRS is enabled can be specified as well as the DRS angle.

In the figure on the right one sees a comparison between a lap with DRS versus a normal lap.