CFD simulation file for Parvancorina sagitta from Russia, relief increased by 30%, oriented at 180° 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 30% was oriented at 180° 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.

计算流体动力学（CFD）模拟采用COMSOL完成。针对取自俄罗斯的箭形帕瓦诺虫（Parvancorina sagitta）模型，将其隆起程度提升30%后，以与水流方向呈180°的姿态固定于半圆柱的下表面。模拟对象为三维不可压缩水流，半圆柱上游端设置法向流入速度入口，下游端设置零压出口；半圆柱顶面与侧面采用滑移边界条件，箭形帕瓦诺虫模型及半圆柱下表面采用无滑移边界条件。计算域采用自由四面体网格划分，通过剪切应力输运湍流模型求解雷诺平均纳维-斯托克斯方程，借助稳态求解器计算稳态流场分布。本次模拟共设置0.1、0.2和0.5 m/s三种入口流速条件。