CFD simulation file for Parvancorina sagitta from Russia, relief increased by 15%, oriented at 90° to the current, MPH format

Computational fluid dynamics (CFD) simulations of water flow were performed in COMSOL. A model of Parvancorina sagitta from Russia with relief increased by 15% was oriented at 90° to the current and was fixed to the lower surface of a half-cylinder. Three-dimensional, incompressible flow of water was simulated with a normal inflow velocity inlet at the upstream end of the half-cylinder and a zero-pressure outlet at the downstream end. Slip boundary conditions were assigned to the top and sides of the half-cylinder, and no-slip boundary conditions were assigned to the Parvancorina model and the lower surface of the half-cylinder. The domain was meshed using free tetrahedral elements and the shear stress transport turbulence model was used to solve the Reynolds-averaged Navier–Stokes equations. A stationary solver was used to compute the steady-state flow patterns. Simulations were performed with an inlet velocity of 0.1, 0.2, and 0.5 m/s.

本研究采用COMSOL开展水流的计算流体动力学（Computational fluid dynamics, CFD）模拟。以产自俄罗斯的箭形帕瓦诺尔虫（Parvancorina sagitta）模型为研究对象，将其隆起度提升15%后，使其与水流方向呈90°夹角固定于半圆柱的下表面。本次模拟针对三维不可压缩水流，在半圆柱上游端设置法向进口速度入口，下游端设置零压出口；半圆柱的顶面与侧面施加滑移边界条件（Slip boundary conditions），箭形帕瓦诺尔虫模型与半圆柱下表面则施加非滑移边界条件（No-slip boundary conditions）。计算域采用自由四面体单元（free tetrahedral elements）进行网格划分，选用剪切应力输运湍流模型（shear stress transport turbulence model）求解雷诺平均纳维-斯托克斯方程（Reynolds-averaged Navier–Stokes equations），并采用稳态求解器（stationary solver）计算稳态流场分布。模拟分别设置0.1 m/s、0.2 m/s与0.5 m/s三种进口流速工况。