Fluid-Structure Interaction Calculation Framework for Non-Rigid Airship Based on Explicit Dynamics

doi:10.16183/j.cnki.jsjtu.2019.351

Abstract

Abstract:

The non-rigid airship is a low-rigidity and inflatable aircraft which has obvious fluid-structure interaction characteristics. In this paper, the unsteady explicit dynamic fluid-structure interaction analysis framework of non-rigid airship is constructed based on the parametric section (PARSEC) method, the radial basis function (RBF), and the Delaunay mapping method. The reliability and accuracy of the numerical method are verified by the cases of plate impact and the aeroelasticity of NACA0014 wing. The calculation framework is also suitable for unsteady bidirectional fluid-structure interaction analysis of thin-envelope aerostats such as high-altitude balloon. Finally, the time domain and frequency domain responses of one non-rigid airship are simulated by the above framework. The research results show that there is an approximately linear relationship between the dominant frequency of vibration and the pressure difference of the airship.

Key words: non-rigid airship, fluid-structure interaction, radial basis function (RBF), Delaunay mapping, parametric section (PARSEC)

CLC Number:

V211.3

ZHANG Yu, WANG Xiaoliang. Fluid-Structure Interaction Calculation Framework for Non-Rigid Airship Based on Explicit Dynamics[J]. Journal of Shanghai Jiao Tong University, 2021, 55(3): 311-319.

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参数	取值
r_h	0.08
x_d	0.3
r_d	0.125
k_d	－0.5
α_t/(°)	0
β_t/(°)	40
h_t	0
d_t	0.02

参数	取值
L/m	45
D/m	11.25
d_env/m	0.001
ρ_env/(kg·m^－3)	100
E_env/GPa	1.2
ν_env	0.3
v_∞/(m·s^－1)	12

网格等级	表面网格单元数	表面网格节点数	网格单元总数	C_Dz
稀疏	6 772	3 207	351 252	0.149
粗糙	10 849	5 184	443 608	0.179
中等	15 146	7 735	525 484	0.198
精细	18 247	8 953	586 337	0.201

传递状态	F_x/N	F_y/N	F_z/N	M_x/(N·m)	M_y/(N·m)	M_z/(N·m)
传递前	903.25	7 628.30	335.85	3 725.90	343.14	3 270.80
传递后	903.29	7 629.50	335.81	3 728.30	343.08	3 272.10
相对误差/‰	0.042	0.157	0.108	0.643	0.161	0.397