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<p>In this paper, we present an ultra-weak discontinuous Galerkin (UWDG) method that employs <i>H</i>(div)-conforming spaces for solving incompressible flows, ensuring exact divergence-free solutions. Leveraging the exact divergence-free property and the continuity of the normal velocity at cell interfaces, the convection term is formulated in conservative form and discretized as the DG method for conservation laws. To achieve a high-order time discretization, we first implement a predictor-corrector procedure utilizing either one-step or multi-step methods. Then, we integrate the spectral deferred correction scheme to develop a linear semi-implicit high-order fully discrete scheme. Numerical experiments demonstrate the efficiency and accuracy of this high-order method.</p>

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Exactly Divergence-Free Ultra-Weak Discontinuous Galerkin Method for Incompressible Flow

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Zhengyang Xue,
  • Yinhua Xia

摘要

In this paper, we present an ultra-weak discontinuous Galerkin (UWDG) method that employs H(div)-conforming spaces for solving incompressible flows, ensuring exact divergence-free solutions. Leveraging the exact divergence-free property and the continuity of the normal velocity at cell interfaces, the convection term is formulated in conservative form and discretized as the DG method for conservation laws. To achieve a high-order time discretization, we first implement a predictor-corrector procedure utilizing either one-step or multi-step methods. Then, we integrate the spectral deferred correction scheme to develop a linear semi-implicit high-order fully discrete scheme. Numerical experiments demonstrate the efficiency and accuracy of this high-order method.