Adjoint based optimization connected with the CAD

Application of adjoint method in computational fluid dynamics makes the calculation of gradients of objective functions with respect to design parameters computationally affordable. By applying traditional methods, e.g methods based on finite differences, the number of simulations required for the gradient calculations increases drastically with an increasing number of design parameters. Through the use of adjoint method is it possible to calculate all gradients in “one shot”.

Multiphase simulation of external water management

One development goal of the Mercedes-Benz aerodynamic department is to achieve a favorable external water management in order to increase both safety and comfort during heavy rain conditions. In the last years the importance and application of CFD for the reduction of aerodynamic drag and aero-acoustic noise is growing strongly. Increasing computational power and maturity of physical models lead to the attempt to use CFD also for the prediction of vehicle soiling instead of pure wind tunnel testing.

CFD simulation of a viscous coupling

Simulation results and validation measurements of a viscous coupling are presented. The analyzed Visco® clutch of MAHLE Behr is used to control the speed of the cooling fan of heavy duty trucks. It consists of a driven primary disc and a secondary housing with an engine cooling fan mounted on it. Highly viscous oil is pumped into small channels between these parts. Therefore, the fan speed depends on the amount of oil and its distribution within the clutch.