摘要：The concept of optimal Delaunay triangulation (ODT) and the
corresponding error-based quality metric are first introduced.
Then one kind of mesh smoothing algorithm for tetrahedral mesh based on the
concept of ODT is examined. With regard to its problem of possible producing
illegal elements, this paper proposes a modified smoothing scheme with a constrained
optimization model for tetrahedral mesh quality improvement. The constrained optimization
model is converted to an unconstrained one and then solved by integrating chaos
search and BFGS (Broyden-Fletcher-Goldfarb-Shanno) algorithm
efficiently. Quality improvement for tetrahedral mesh is finally achieved by
alternately applying the presented smoothing scheme and re-triangulation. Some
testing examples are given to demonstrate the effectiveness of the proposed
approach.
