Meshing using neural networks for improving the efficiency of computer modelling

Abstract

This work presents a novel approach capable of predicting an appropriate spacing function that can be used to generate a near-optimal mesh suitable for simulation. The main objective is to make use of the large number of simulations that are nowadays available, and to alleviate the time-consuming mesh generation stage by minimising human intervention. For a given simulation, a technique to produce a set of point sources that leads to a mesh capable of capturing all the features of the solution is proposed. In addition, a method to combine all sets of sources for the simulations available is devised. The global set of sources is used to train a neural network that, for some design parameters (e.g., flow conditions, geometry), predicts the characteristics of the sources. Numerical examples, in the context of three dimensional inviscid compressible flows, are considered to demonstrate the potential of the proposed approach. It is shown that accurate predictions of the required spacing function can be produced, even with reduced training datasets. In addition, the predicted near-optimal meshes are utilised to compute flow solutions, and the results show that the computed aerodynamic coefficients are within the required accuracy for the aerospace industry. An analysis is also presented to demonstrate that the proposed method lies in the category of green AI research, meaning that computational resources and time are substantially reduced with this approach, when compared to current practice in industry.

Deep learning in computational mechanics: a review

“…Finally, many simulation techniques rely on meshes. This can be achieved indirectly with NNs, by prediction of mesh density functions [358][359][360][361][362] incorporating either expert knowledge of where small elements are needed, or relying on error estimations. Subsequently, a classical mesh generator is employed.…”

Virtual simulation of fracture behavior of concrete blocks under blast loading

“…Current research on the response and failure mechanisms of concrete structures under explosive impact loads primarily employs numerical simulation methods to explore the analysis of target damage and fracture [14][15][16][17][18][19][20]. However, numerical simulation methods typically require a substantial amount of computational resources due to complex mathematical modeling and large-scale iterative calculations [21][22][23]. Moreover, the complexity of the model can affect computational efficiency [24].…”

Generating Near-Optimal Meshes Using Green AI

“…In this talk, two strategies to predict the near-optimal spacing for a given operating condition and geometric configuration will be presented. The first strategy aims at predicting the position and spacing characteristics of a set of point sources that will be used in the on-line phase to produce a near-optimal mesh [1]. The second strategy aims at predicting the a discrete spacing in a given background mesh, which again is then used in the on-line phase to produce a near-optimal mesh [2].…”