基于计算缩放的光滑粒子水动力学方法模拟飞机油箱剧烈晃动问题  

Computational scaling of SPH simulations for violent sloshing problems in aircraft fuel tanks

作　　者：Calderon-Sanchez Javier Martinez-Carrascal Jon Gonzalez Leo Miguel 

机构地区：[1]CEHINAV Model Basin,ETSI Navales,Universidad Politécnica de Madrid,Madrid,28040,Spain

出　　处：《Acta Mechanica Sinica》2023年第2期39-48,共10页力学学报（英文版）

基　　金：supported by European Union (EU) (Grant No.H2020-815044)“Sloshing Wing Dynamics (SLOWD)”;support from the Spanish Ministry for Science,Innovation and Universities (MCIU) (Grant No.RTI2018-096791-B-C21)“Hidrodinámica de elementos de amortiguamiento del movimiento de aerogeneradores flotantes”;funding from Universidad Politécnica de Madrid under a pre-doctoral scholarship.

摘　　要：大型民用飞机的机翼设计用于承受从大气阵风到湍流到着陆冲击的各种载荷,机翼是需要进一步研究的重要结构.改进机翼设计的主要方法之一是分析晃动对承载液体的柔性机翼状结构动力学的阻尼效应.这将通过开发实验装置来实现,该装置将有助于建立和再现涉及物理领域的数值模型.因此,本工作的目的是使用数值方法光滑粒子流体动力学(SPH)作为主要数值工具,分析晃动在降低飞机结构设计载荷方面的影响.本研究中的一个关键因素是对比例实验的需求,这是评估计算工具是否能够准确近似不同比例的注册测量值的必要步骤.为此,建立了一个垂直振动水槽的数值模型,该模型是一个完全耦合的流固耦合问题.该结构通过质量-弹簧-阻尼器系统建模,对于内部流体,使用δ-SPH方法.特别是,研究了两个开放性问题:第一个问题是,当储罐的初始加速度是标准重力值的十倍时,重力对阻尼和能量耗散现象的影响程度;第二种问题旨在确认,当根据量纲分析对问题参数进行缩放时,SPH方程正确地再现了缩放定律.The wings of large civilian aircraft are designed to withstand a variety of loads whose causes range from atmospheric gusts to turbulence to landing impacts.Aircraft wings are essential structures that demand further research.One of the primary methods used for improving wing design is analysis of the damping effects that sloshing induces on the dynamics of flexible wing-like structures carrying liquids.This will be attained through the development of experimental set-ups that will help in building up numerical models that are used to reproduce the physics involved.Hence,the aim of this work is to analyze the effect of sloshing in reducing the design loads on aircraft structures using the numerical method smoothed particle hydrodynamics(SPH)as the main numerical tool.One of the key considerations in this research is the demand for scaled experiments,making it a necessary step in assessing whether computational tools are able to approximate the registered measurements for different scales accurately.To this end,a numerical model of a vertically oscillating tank built as a fully coupled fluid-structure interaction problem is developed.The structure is modelled through a mass-spring-damper system,and for the inner fluid theδ-SPH methodology is used.In particular,two open questions are studied:the first one is to what extent gravity has an influence on the damping and energy dissipation phenomena when the initial acceleration of the tank is ten times the standard gravity value.The second seeks to confirm that the SPH equations correctly reproduce the scaling laws when the problem parameters are scaled according to the dimensional analysis.

关 键 词：SPH SLOSHING GRAVITY Computational scaling 

分 类 号：V228.11[航空宇航科学与技术—飞行器设计]