Simulating Turbulence Accurately and Efficiently

 

Turbulence is unarguably the most challenging area in fluid dynamics. It is the most limiting factor in accurate computer simulation of engineering flows. Turbulence flow constitutes a classic multiscale problem, one that is far beyond human intuitive understanding ― as well as beyond resolution capabilities of the most powerful modern parallel computers (for any foreseeable future).

Detached delayed-eddy simulation of flow over aircraft landing gear computed with ANSYS Fluent

Detached delayed-eddy simulation of flow over aircraft landing gear captures the turbulent flow structures created by the landing gear structure. The computation is performed with ANSYS Fluent.

Nobel-prize winning physicist Richard Feynman once described turbulence as the "most important unresolved problem in classical physics." An even more pronounced quote is associated to Werner Heisenberg: "When I meet God, I am going to ask him two questions: Why relativity? And why turbulence? I really believe he will have an answer for the first."

No single model or modeling approach can solve all types of turbulent flow, so different types of turbulence models have been developed in the past decades. So choosing the right turbulence model to match the application is critical to accuracy and computational resource optimization. ANSYS is a technology leader in this area, offering a wide range of the most advanced model formulations, including WMLES, ELES and transition models.

The following materials provide details about turbulence modeling.