Adaptives Verfahren zur effizienten numerischen Simulation mehr-skaliger Phänomene bei der Windumströmung von Bauwerken
Structural Engineering, Building Informatics and Construction Operation
Final Report Abstract
The project has developed a novel adaptive solution strategy for Vortex Particle Methods (VPM) that allows the efficient resolution of multiple scales that are characteristic of flows around bluff bodies with small structural details. The efficiency of the method arises from maintaining a sufficiently high spatial numerical discretization near the fluid-solid interface and a progressive coarsening away from the bodies and their structural details. The control of the particle map is achieved through remeshing based on high-order interpolation kernels and ensures an accurate representation of the flow features of different scales whose resolution is critical to an accurate computation of the pressures on the immersed structure subjected to separated flows. As the required time step of the time integration is directly related to the spatial resolution, the scheme is further enhanced by a temporal adaptivity realized through a sub-stepping technique for controlling the frequency at which the particle convection and diffusion steps are performed. The validation of the proposed technique was performed by simulations of the impulsively started flow past a circular cylinder at Reynolds number 3000, where both the spatial and the temporal strategies were at first independently studied and then combined to full adaptivity. A substantially higher computational efficiency compared to equally accurate non-adaptive simulations was observed. Further studies of accuracy and efficiency were performed by simulating the flow past the cross section of a bridge arch geometry featuring important small structural details. The parameters of the spatial and temporal resolution components are designed in such a way that they can be utilised for regional discretization that is either pre-defined such as implemented so far or being driven by other criteria such as error estimation techniques. As such the scheme is a flexible method to locally control resolution in VPM and thus to balance accuracy and computational cost. Further, the project has developed a GPU-based parallelization of the VPM implementation, specifically of the P3M method for the velocity field solution, which massively improves solution performance on modern computer architectures.
Publications
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Parallels between wind and crowd loading of bridges, Philosophical Transactions of the Royal Society A, Vol. 371 (2013), pp. 20120430–20120430
McRobie, Allan; Morgenthal, Guido; Abrams, Danny & Prendergast, John
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A GPU-accelerated pseudo-3D vortex method for aerodynamic analysis, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 125 (2014), pp. 69–80
Morgenthal, Guido; Sánchez Corriols, Abraham & Bendig, Benjamin
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Adaptive Methods for the Simulation of Multiscale Fluid Dynamic Phenomena Using Vortex Particle Methods with Applications to Civil Structures, IV. International Conference on Particle-based Methods, 2015
Milani, D., Morgenthal, G.
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Temporal and Spatial Adaptation Strategies in Aerodynamic Simulation of Bluff Bodies Using Vortex Particle Methods, 17th International Conference on Fluid Mechanics and Applications, 2015
Milani, D., Morgenthal, G.
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Accuracy Comparison of Different Approaches for Vortex Sheet Discretization on the Airfoil in Vortex Particle Method, V. International Conference on Particle-based Methods, 2017
Kuzmina, K.S., Marchevsky, I.K., Milani, D., Ryatina, E.P.
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(2018) Methods for controlling the local spatial and temporal resolution of vortex particle simulations of bluff body aerodynamics problems. Computers & Fluids 166 225–242
Milani, Dario & Morgenthal, Guido
