Delamination Growth Simulation with a Moving Mesh Technique

2009 ◽  
Author(s):  
S. Rinderknecht ◽  
B. Kroplin
Keyword(s):  
Moving Mesh ◽  
Growth Simulation ◽  
Delamination Growth ◽  
Mesh Technique

Transient Analysis of a Spring-Loaded Pressure Safety Valve Using Computational Fluid Dynamics (CFD)

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Xue Guan Song ◽  
Lin Wang ◽  
Young Chul Park
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Safety Valve ◽  
Three Dimensional ◽  
Pressure Vessels ◽  
Moving Mesh ◽  
Cfd Model ◽  
Ansys Cfx ◽  
Computational Fluid Dynamics Cfd ◽  
Mesh Technique

A spring-loaded pressure safety valve (PSV) is a key device used to protect pressure vessels and systems. This paper developed a three-dimensional computational fluid dynamics (CFD) model in combination with a dynamics equation to study the fluid characteristics and dynamic behavior of a spring-loaded PSV. The CFD model, which includes unsteady analysis and a moving mesh technique, was developed to predict the flow field through the valve and calculate the flow force acting on the disk versus time. To overcome the limitation that the moving mesh technique in the commercial software program ANSYS CFX (Version 11.0, ANSYS, Inc., USA) cannot handle complex configurations in most applications, some novel techniques of mesh generation and modeling were used to ensure that the valve disk can move upward and downward successfully without negative mesh error. Subsequently, several constant inlet pressure loads were applied to the developed model. Response parameters, including the displacement of the disk, mass flow through the valve, and fluid force applied on the disk, were obtained and compared with the study of the behavior of the PSV under different overpressure conditions. In addition, the modeling approach could be useful for valve designers attempting to optimize spring-loaded PSVs.

Guidance of Multi-Agent Fixed-Wing Aircraft Using a Moving Mesh Method

2016 ◽  
Vol 04 (03) ◽  
pp. 227-244 ◽  
Author(s):  
A Ram Kim ◽  
Shawn Keshmiri ◽  
Weizhang Huang ◽  
Gonzalo Garcia
Keyword(s):  
Degrees Of Freedom ◽  
Moving Mesh ◽  
Unmanned Aerial Systems ◽  
Moving Mesh Method ◽  
Large Solution ◽  
Mesh Method ◽  
Spatial Dimensions ◽  
Multi Agent ◽  
Aerial Systems ◽  
Mesh Technique

This paper presents a novel guidance logic for multi-agent fixed-wing unmanned aerial systems using a moving mesh method. The moving mesh method is originally designed for use in the adaptive numerical solution of partial differential equations, where a high proportion of mesh points are placed in the regions of large solution variations and few points in the rest of the domain. In this work, the positions of the aircraft are considered as mesh nodes connected to form a triangular mesh in two spatial dimensions. The outer aircraft positions are planned with the reference point algorithm. This logic provides the outer agents moving point positions that are relative to a virtual point position with the desired heading angle and velocity. The inner agents, or interior mesh nodes, are moved with a moving mesh technique to keep the whole mesh as uniform as possible. The moving mesh technique has built-in mechanisms to keep the mesh as uniform as possible and prevent nodes from crossing over or tangling. This property can be seen as an automatic internal collision avoidance mechanism. It also has explicit formulas for nodal velocities, making the technique easy to implement on computer. The mesh nodes are replaced by unmanned aerial systems with nonlinear six degrees of freedom dynamics. The centralized moving mesh guidance is complimented by a decentralized nonlinear predictive controller to control each aircraft. To validate flexibility and coherency of agents and formation, the moving point concept is used in the simulation to follow an arbitrary, linear, sinewave-like, or curvature shaped flight segments. Robustness of the algorithm is also verified where agents were affected by external wind.

Numerical modeling of CO2 diffusion into water-oil liquid system using moving mesh technique

Fuel ◽  
2020 ◽  
Vol 261 ◽  
pp. 116426
Author(s):  
Wei Liu ◽  
Lin Du ◽  
Xiaoyuan Qin ◽  
Xingyi Chen ◽  
Wen Liu ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Liquid System ◽  
Moving Mesh ◽  
Co2 Diffusion ◽  
Mesh Technique

scholarly journals Numerical Investigation of Two-Phase Flows in Corrugated Channel with Single and Multiples Drops

Fluids ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 13
Author(s):  
Gustavo R. Anjos
Keyword(s):  
Numerical Investigation ◽  
State Of The Art ◽  
Moving Mesh ◽  
Moving Frame ◽  
Arbitrary Lagrangian Eulerian ◽  
Two Phase Flows ◽  
Two Phase ◽  
Interface Deformation ◽  
Corrugated Channel ◽  
Mesh Technique

This work aims at investigating numerically the effects of channel corrugation in two-phase flows with single and multiples drops subject to buoyancy-driven motion. A state-of-the-art model is employed to accurately compute the dynamics of the drop’s interface deformation using a modern moving frame/moving mesh technique within the arbitrary Lagrangian–Eulerian framework, which allows one to simulate very large domains. The results reveal a complex and interesting dynamics when more than one drop is present in the system, leading eventually in coalescence due to the amplitude of the corrugated sinusoidal channel and distance between drops.

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