A gas turbine is a type of internal combustion engine that can be used to produce shaft work output, e.g. for driving an electric generator. In one of our recent projects with SIEMENS, we developed an easy-to-use and highly efficient workflow for the optimization of blade designs for stationary gas turbines, including endwall contouring.
Today‘s car manufacturers inevitably have to focus on the reduction of fuel consumption while maintaining high performance standards. In this respect, turbocharged direct injection diesel engines represent an appealing solution. The challenge in developing these engines is – in addition to above-mentioned reduction of fuel consumption and high performance standards – the reduction of raw emissions. This is a case study from VW.
Automotive torque converters are a type of fluid coupling used in vehicles with automatic transmissions to transfer rotating power from the engine to the drive shaft. Designers of torque converters strive to maximize efficiency and torque ratio at high speeds by minimizing cavitation in the device and ensuring good flow behavior of the transmission fluid.
An automated and simultaneous optimization of a vaned diffusor and volute of a centrifugal compressor for a large turbocharger was studied in this project at TU Darmstadt (Institute of Gas Turbines and Aerospace Propulsion). The study was done in cooperation with NUMECA Germany and Kompressorenbau Bannewitz (KBB). For the automated generation of geometry, CAESES® came into play, while NUMECA products were used for the meshing and CFD part.
Control valves are used in a wide range of industries, and they regulate the flow of various fluids. For a project at ARCA Valves, the flow through such a control valve needed to be optimized. The challenge was to design a flexible parameterized geometry model of the valve housing that additionally incorporated a set of constraints.
The Voith Linear Jet (VLJ) combines the best properties of propellers with the best properties of waterjets. For this product, the design challenge is to maintain high efficiency across wide operating range while delaying the onset of cavitation. VLJ is an ideal propulsor for ships with mixed operating profile between low and high speeds like yachts, workboats, and patrol vessels.
In this case study, the rear wing of a hyper sports car was optimized with respect to the drag and downforce. For the adjoint CFD computations, the flow simulation package iconCFD was utilized. The parametric model of the rear wing was set up in CAESES®, as well as the mapping of the adjoint solution to the geometry parameters.
When the French marine technology experts at Sirehna set out to design the turbine for OpenHydro, the Irish tidal technology specialist, for the world’s first large-scale tidal energy farm, they turned to CAESES® for it’s design and optimization. CAESES®’ Upfront CAD was used to design the turbine. This geometry model enabled automated generation of design variants ready to go for simulation.
FRIENDSHIP SYSTEMS investigated the aerodynamic behaviour of a vertical-axis wind turbine (VAWT) in collaboration with the US-based company Pointwise. In a first phase of what should be a multi-phase effort, FRIENDSHIP SYSTEMS was able to demonstrate successfully how to automate mesh generation with Pointwise, integrate Pointwise into CAESES®, and use the two (along with other tools) to optimize in 2D the VAWT.
In 2014, Caterpillar Propulsion introduced CAESES® for the design of propeller blades. When we started on a project basis, the overall idea was to implement CAESES® as some sort of workbench that integrates and controls all the participating meshing and simulation software. At the same time, CAESES® should also deliver the 3D parametric blade design which allows the Caterpillar engineers to remodel their existing blade and profile definitions, but also gives high flexibility for trying out completely new designs.
FRIENDSHIP SYSTEMS prepared an example for linking CAESES® to OpenFOAM for a workshop that was held in October 2014. The following summary is also available as tutorial. The blade is generated by using the “Generic Blade” type of CAESES®. With this, one can define custom profile descriptions, as well as radial distributions for each profile parameter.
With a capacity of 14,000 TEUs, an overall length of 365.5 meters and a deadweight of 165,517 metric tons, the MSC Danit became the world’s largest container vessel when finished by Korean shipyard Daewoo Shipbuilding & Marine Engineering (DSME) in 2009. DSME used CAESES® for the optimization of proven parent ships.
For the optimization of an axial compressor blade, in a collaboration with Rolls Royce Deutschland (RRD), two different optimization approaces were chosen and compared. The results of this study showed that both approaches led to very similar results, while the parametric 3D blade model in combination with a different optimization strategy helped to achieve these results within a very fast time frame.