Fluid Dynamics

Computational Fluid Dynamics (CFD) simulations can be a powerful tool assisting the design process, provided that the required expertise is exercised in the definition of the objectives, in the setup and realization of the simulation and in the interpretation of the results.

Our CFD services are most commonly related to the following tasks:

  • Insight into the flow characteristics of complex geometries
  • Flow analysis for design optimization
  • Reduction of drag for external flows
  • Reduction of pressure loss for internal flows

A typical procedure for CFD engineering services at Tplus Engineering GmbH covering the full spectrum from the CAD model to the CFD results is sketched below.

Definition Phase

fluid 1 turbocharger

Due to our specialization in the theory of numerical modelling and uncertainties in CFD, we evaluate the objectives of a CFD simulation a-priori and define realistically what results can be expected. Our part is to consult you with our experience, in which situations CFD can help - and in which not. For the CFD simulations, we identify the required computational models and simulation types suited best to represent your problem both accurately and efficiently.

Geometry Phase

The component design, e.g. in the form of modifications or new concepts, is defined. Our part is to consult you in the design process with regards to the expected flow characteristics. For the geometry preparation and CAD cleanup, we rely on a variety of different tools with different levels of robustness to CAD quality.

Meshing Phase

The generation of the computational mesh for the numerical representation of the problem is one of the most important steps in the simultion process. Special emphasis is set on a high quality mesh for a reduction of errors due to spatial discretization. Depending on the complexity of the configuration, we use different meshing algorithms, from Delaunay and Octree to advanced surface wrapping methods.

Simulation Phase

turbine2

One of our main advantages is that we are able to offer CFD services on basis of a number of different CFD codes. This allows us selecting the solver that we consider suited best to solve the problem at hand. For example, a CFD simulation in the field of turbomachinery may have diverse requirements compared to a simulation from the automotive sector. An aerodynamical problem may be solved differently than a thermodynamical problem. Compressibility, buoyancy or rotation are other effects affecting the choice of flow solver. Here, our portfolio from open-source to commercial CFD codes gives us the maximum flexibility.

Post-processing phase

In the post-processing of the results obtained from the CFD simulations it is most important to not only present visualizations but to provide profound engineering interpretation. Even with latest most sophisticated CFD toolboxes, a critical review of the results is always indispensable. At Tplus Thermal Engineering, we have profound experience in evaluating the results of CFD predictions with respect to their level of confidence.