SC/Tetra has been validated for calculating vehicle aerodynamic performance and improving the design of passenger comfort systems. It is also widely used as a design tool for a multitude of automotive components and systems.

Vehicle Aerodynamics

Cd (drag coefficient) and Cl (lift coefficient) are used to characterize a vehicle’s aerodynamic performance. These coefficients have been traditionally determined by wind tunnel tests. However, SC/Tetra has been validated for calculating aerodynamic performance with minimum error compared to experiment data. SC/Tetra can model precise underbody details and pipes due to its highly tuned solver that consumes minimal memory. Software Cradle is dedicated to continually improving SC/Tetra’s accuracy and capabilities. The company also provides technical support by conducting complex, high level simulations for its clients.

Passenger Comfort

In addition to vehicle aerodynamics, optimization of interior climate control systems is also an important CFD application. Applications include interior heating and cooling (including solar radiation) and windshield defogging and defrosting. SC/Tetra is capable of handling very complicated geometries with its sophisticated and robust grid generator and low memory consumption solver. In addition, SC/Tetra offers unique capabilities for predicting occupant comfort by employing a fully coupled human body thermoregulatory model. This model considers the detailed human body vascular system and individual physiological factors.

Air Conditioner Ventilation Duct

SC/Tetra is used for designing an air conditioner ventilation ductwork. CFD makes it possible to compute efficiently balanced air distribution enabling design optimization where space is extremely limited.

Underhood Cooling

Engine compartment ventilation, such as radiator cooling performance, is an important CFD application. SC/Tetra is suitable for accurate computations of highly complex geometrical models including engine, radiator fan, accessories, and vehicle underbody details. This analysis can including calculating the pressure drop through the radiator.

Side View Mirror

In addition to simulating vehicle aerodynamics, CFD is also used to optimize the shape of individual vehicle components that affect the overall aerodynamics. One example is a side view mirror. The side view mirror must satisfy a range of design criteria including being positioned to reflect the proper views, minimizing drag, repelling droplets of water on the mirror surface, and minimizing production of aerodynamically induced acoustic noise. SC/Tetra can be used to evaluate different design concepts in a short amount of time.


Intake and exhaust manifolds performance are usually first simulated in steady state to ensure a uniform pressure distribution. Transient analysis is used to determine if reverse flows exist. In addition to internal flow simulation, an exhaust manifold should be thermally simulated to ensure correct material selection and material thicknesses.

Heat Exchanger (Radiator, Intercooler, Oil Cooler, Water Jacket)

A CFD simulation of an heat exchanger e.g. a radiator, considers two working fluids – usually air and water/coolant. CFD is used to determine the efficiency of the heat exchanger which is directly a function of the velocity of the fluids at the wall. CFD also predicts whether the coolant flow is uniform within the heat exchanger.

Engine valve

For engine valve analyses, the swirl ratio and/or tumble ratio are important fuel mixture parameters that greatly influence combustion and emissions. SC/Tetra is used for calculating and optimizing inlet and exhaust valve design geometries.

Torque Converter

Automatic transmission torque converter designs can be optimized using SC/Tetra to calculate pressure distribution as well as total torque produced by the rotating blades.