STEM Racing · Pit Lane · DT Classroom

Setup Controls entry

Design bay · dashed box = class length / width / height limits

Component Materials

Ballast 0 g

Real teams add ballast to reach minimum mass: placed low for stability.

Build Sheet

Test section · flow L→R Floor stall

Live Aero Data

Flow Lab · computed 2D airflow

A lattice-Boltzmann solver works out the air around your own car, cell by cell, straight from the Design Studio. Use it to compare shapes and spot where the wake forms.

Classroom research model: 2D only and not checked against a real tunnel. Compare designs with it; do not quote its numbers as drag, downforce or lap time.

Test setup

Body under test

View

Include wheels

Moving floor (rolling road)

On: the floor moves with the air, as the track does under a running car. Off: a still tunnel floor.

Wind speed 18 m/s

Solved in low-speed lattice units, then scaled to m/s for display.

Field colour

Flow tracers 26

Each dot is carried by the solved air speed, not a drawn-on line.

Tracer start region

Velocity arrows

Cutting line

Moves the dashed line the graph samples along.

No baseline saved

Flow Lab · flow L→R ITERATION 0000

0 m/s

Cutting-line speed

Hover the graph to read values

this run saved baseline inlet speed. Shaded bands are inside the body.

Probe

Move over the flow to inspect a cell; click to pin the probe.

Cell x, y-

Local speed-

Relative pressure-

Probe follows the pointer

Live readings

Wake / inlet-speed recovered behind the car

Against baselineNO BASE

Cut-line mean-

Inlet-

Wake centre-

Upper bypass-

Probe pressure-

Wake swingmeasuring

Iteration0

SolverWARMING UP

Iterations are solver steps, not seconds. * Established means steady in the solver, not proven correct. Compare only after iteration 480.

Try this investigation

Choose My car in side profile. Wait for FLOW ESTABLISHED, then press Save baseline.
Open the Design Studio and change one thing: the nose cone, or the rear body width (rear width shows up in plan view, so save that baseline in plan view).
Come back here. Flow Lab rebuilds your car and restarts. Once it passes iteration 480, read Against baseline: a positive number means faster air in the wake, so a smaller wake.
Press Log to engineering log and write down why you made the change.

Compare with the Wind Tunnel tab

Wind Tunnel gives a fast empirical estimate of Cd and Cl for the whole 3D car, built from rules of thumb for each part (body, wheels, wings).

Flow Lab actually computes the airflow, but only on a 2D slice at classroom resolution, so its numbers are for relative comparisons only.

If both tabs agree that a change helps, that is stronger evidence than either one on its own. If they disagree, that is worth a line in your logbook.

What is real: the airflow is calculated by a D2Q9 lattice-Boltzmann solver (single relaxation time, BGK) written for this tool. The body is built from your car's own side profile or plan shape at one fixed scale, solid cells bounce the air back, and the colours, tracers, probe, graph, CSV and report all read the solver's numbers directly.

What is not established: this is a 2D slice, so air cannot go round the sides of the car in side profile, or over and under it in plan view. The model has not been convergence-tested or checked against wind tunnel measurements. The lattice is coarse (one cell is 2.5 mm), so the gap under the car is only a few cells tall. The front wing, sidepods, tether guides and cartridge are left out and the rear wing is a flat plate. Pressure in pascals is a scaled illustration and rotation is in lattice units. Use it to compare designs under the same settings; it cannot certify drag, lift, scrutineering compliance or race times.

Scrutineering Bay

Check	Measured	Limit	Result	Rule source

20 m straight · timing to 0.001 s

Pick an opponent, then arm the start. Launch on lights-out: SPACE or the button.

Race Control

Opponent

Leaderboard

#	Team / Car	Time

Race telemetry

Predicted 20 m run

Y axis Range

Your predicted 20 mn/a

Comparison 20 mn/a

Car-only deltan/a

Your peak speedn/a

5 m n/a10 m n/a15 m n/a20 m n/a

Point probeDistance n/aYou n/aComparison n/aElapsed n/aTime gap n/a Hover to inspect · click to pin · arrow keys to step · Esc to unpin

Engineer's Logbook

When	Car	Activity	Data	Engineer's note

Beyond this tool: a STEM Racing portfolio is judged on more than lap time. Before submission, make sure you can also cover —

Engineering: the design-iteration story this logbook records: what you changed, what you tested, and why.
Enterprise & marketing: team identity, sponsorship, costing and branding (your livery is a start).
Verbal presentation & pit display: being able to explain the trade-offs behind your final car to judges.

Engineering Report

Current garage car

Regulation checks Checking

Limits follow the class and any staff changes in your garage. Check the official rules before you make anything.

Development priorities

From your failed checks and from simulated changes that do not break another rule. Test any change on the real car.

Your car against the kit car

Same simulated environment and race model for both. Reaction time is left out.

Your evidence

After each change, record the wind tunnel run, launch test and race in the Logbook. That is the iteration story a portfolio is judged on.

Pit Lane · STEM Racing Simulator

Setup Controls entry

Component Materials

Build Sheet

Live Aero Data

Structural Report

Friction Report

Test setup

Cutting-line speed

Probe

Live readings

Try this investigation

Compare with the Wind Tunnel tab

Scrutineering Bay

Race Control

Leaderboard

Race telemetry

Engineer's Logbook

Engineering Report

Regulation checks Checking

Development priorities

Your car against the kit car

Your evidence

Pit Lane · STEM Racing Simulator

Setup Controls entry

Component Materials

Build Sheet

Live Aero Data

Structural Report

Friction Report

Test setup

Cutting-line speed

Probe

Live readings

Try this investigation

Compare with the Wind Tunnel tab

Scrutineering Bay Re-check

Race Control

Leaderboard

Race telemetry

Engineer's Logbook Export portfolio

Engineering Report RecalculatePrint / PDFDownload report

Regulation checks Checking

Development priorities

Your car against the kit car

Your evidence

Scrutineering Bay

Engineer's Logbook

Engineering Report