In the Lagrangian meshless（particle） methods, such as the smoothed particle hydrodynamics（SPH）, moving particle semi-implicit（MPS） method and meshless local Petrov-Galerkin method based on Rankine source solution（MLPG_R）, the Laplacian discretisation is often required in order to solve the governing equations and/or estimate physical quantities（such as the viscous stresses）. In some meshless applications, the Laplacians are also needed as stabilisation operators to enhance the pressure... 

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