Thin-wall Model for Use in Multiple Casting Conditions

2014 ◽  
pp. 293-300
Author(s):  
A. T. Noble ◽  
C. A. Monroe ◽  
A. K. Monroe
Keyword(s):  
Thin Wall ◽  
Wall Model

Abstraction of Semantic Mid-Surface Based on Rib-Feature Recognition

2015 ◽  
Author(s):  
Huawei Zhu ◽  
Yusheng Liu
Keyword(s):  
Feature Recognition ◽  
High Efficiency ◽  
Surface Patch ◽  
Surface Model ◽  
Thin Wall ◽  
Wall Model ◽  
Element Analysis ◽  
Model Decomposition ◽  
Surface Patches ◽  
Surface Regeneration

Mid-surface abstraction is an effective simplification method for thin-wall models. The complexity of finite element analysis (FEA) for a mid-surface model can be reduced greatly after abstraction. Although the model decomposition method is adopted for mid-surface extraction, it is hard to obtain the correct mid-surface model for complex models since the existing heuristic rule based methods lack of design intention. In addition, the mid-surface model is not easy to reuse. In this study, a semantic based mid-surface model representation and generation method is proposed. Firstly, a hierarchical semantic mid-surface model based on rib-feature decomposition is proposed. Secondly, based on the reorganization of rib-features and decomposition of the thin-wall model, the rib-features’ semantic information are obtained by the abstraction of the structure and connection in the thin-wall model. Then the hierarchical structure is generated by connection semantics. According to the various structure semantics, different abstraction methods will be employed to get the mid-surface patch for each sub region. Finally, the hierarchical semantic mid-surface model is constructed by the generation of the connection relationship between mid-surface patches based on the connection semantics between the rib-features. This semantic model ensures the high efficiency and accuracy of mid-surface regeneration when local modifications occur to a thin-wall model. A typical example is given to demonstrate the process.

scholarly journals From 0D to 3D Aero-Thermo-Fluid Simulations of a Fan Outlet Guide Vane Cooler (FOGVC)

2021 ◽  
Author(s):  
Luis Costero Sánchez ◽  
Klaus Höschler ◽  
Sagar Sadananda Bhat
Keyword(s):  
Cross Section ◽  
Guide Vane ◽  
Rectangular Cross Section ◽  
Circular Cross Section ◽  
Heat Rate ◽  
Internal Cavity ◽  
Thin Wall ◽  
Wall Model ◽  
Ansys Fluent ◽  
First Time

As the first time, 0D-1D-3D and fully 3D steady-state aero-thermo-fluid simulations of a structural oil-to-air Fan Outlet Guide Vane Cooler (FOGVC) in a jet engine are presented. Using the commercial softwares Ansys Fluent, the thermo-mechanical module of Ansys and the 1D fluid solver Flownex, 5 simulation types (3D fully conjugate heat transfer with and without a thin wall model, 3D with a thin wall model, 1D-3D coupled, 1D and 0D) corresponding to 4 levels of simplification in 3 possible domains (oil, oil-metal and oil-metal-air) have been compared to provide selection criteria when a determined level of accuracy in the simulations without prohibited computational times is desired. The methodologies are applied to two different oil internal cavities: an inverted U with rectangular cross section and a coil internal cavity with a circular cross section. The obtained results show that depending on the scope of the research (outlet oil temperature, dissipated heat rate or oil pressure drop) and the accuracy of the results, one method or the other may be used. Experimental data would be needed to validate the numerical results by all employed methodologies and geometries.

Investigation of Performance of Active Microcapsule Actuation

Aerospace ◽  
2003 ◽  
Author(s):  
Honghui Tan ◽  
Donald J. Leo ◽  
Taigyoo Park ◽  
Timothy E. Long
Keyword(s):  
Fluid Pressure ◽  
Ideal Gas ◽  
Thick Wall ◽  
Thin Wall ◽  
Wall Model ◽  
Responsive Materials ◽  
Hollow Particles ◽  
Hydrocarbon Solvents ◽  
Stimulus Responsive ◽  
Micro Actuators

Microcapsules are micron-sized hollow particles that can be synthesized with fluid encapsulated in the interior. The microcapsules can be used as a potential actuation technique by incorporating stimulus-responsive materials, such as permeselective, light-sensitive and electrically sensitive materials. The microcapsules range from 10 to 80 microns in diameter and wall thickness normalized to radius might range from 0.05 to 0.5. The actuation concept is to control the size of the microcapsules by varying the interior fluid pressure using an external stimulus. This paper presents efforts to model the performance and capabilities of microcapsules as micro actuators. We assume the pressure of the fluid inside of the microcapsules can be controlled by certain technique, such as thermal, electro or optical stimulus to the fluid. This paper will focus at modeling the performance of microcapsules under known pressure variation of fluid inside. First the paper compares a thin-wall model to a thick-wall model and identifies that thin-wall theory is not accurate enough for microcapsules. Simulation results show that energy density inthe order of 3J/cm3 is theoreticaly achievable for thick microspheres. Two type of materials are studied as the materials encapsulated in microcapsules. Their constitutive equations are then incorporated into the thick-wall model. Simulations show hydrocarbon solvents are much more efficient than ideal gas in terms of actuation performance.

Thin-wall Model for Use in Multiple Casting Conditions

2014 ◽  
pp. 293-300
Author(s):  
A.T. Noble ◽  
C.A. Monroe ◽  
A.K. Monroe
Keyword(s):  
Thin Wall ◽  
Wall Model

scholarly journals A Nonlinear Thin-Wall Model for Vein Buckling

2010 ◽  
Vol 1 (4) ◽  
pp. 282-289 ◽  
Author(s):  
Avione Y. Lee ◽  
Hai-Chao Han
Keyword(s):  
Thin Wall ◽  
Wall Model

Electron Microscopy of Graphite Intercalation Compounds

1982 ◽  
Vol 40 ◽  
pp. 544-545
Author(s):  
G. Timp ◽  
L. Salamanca-Riba ◽  
L.W. Hobbs ◽  
G. Dresselhaus ◽  
M.S. Dresselhaus
Keyword(s):  
Electron Microscopy ◽  
Phase Transitions ◽  
Domain Wall ◽  
Intercalation Compounds ◽  
Lattice Plane ◽  
Wall Model ◽  
Graphite Intercalation Compounds ◽  
Fundamental Symmetry ◽  
Graphite Intercalation

Electron microscopy can be used to study structures and phase transitions occurring in graphite intercalations compounds. The fundamental symmetry in graphite intercalation compounds is the staging periodicity whereby each intercalate layer is separated by n graphite layers, n denoting the stage index. The currently accepted model for intercalation proposed by Herold and Daumas assumes that the sample contains equal amounts of intercalant between any two graphite layers and staged regions are confined to domains. Specifically, in a stage 2 compound, the Herold-Daumas domain wall model predicts a pleated lattice plane structure.

Optimization of thin-wall structures using hybrid gravitational search and Nelder-Mead algorithm

2016 ◽  
Vol 58 (1) ◽  
pp. 75-78 ◽  
Author(s):  
Ali Rıza Yıldız ◽  
Enes Kurtuluş ◽  
Emre Demirci ◽  
Betul Sultan Yıldız ◽  
Selçuk Karagöz
Keyword(s):  
Thin Wall ◽  
Wall Structures ◽  
Gravitational Search ◽  
Nelder Mead Algorithm

ALAR 00.12

Alloy Digest ◽  
1956 ◽  
Vol 5 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Heat Treating ◽  
Thin Wall ◽  
Casting Alloy ◽  
Aluminum Casting ◽  
High Corrosion Resistance ◽  
Aluminum Casting Alloy ◽  
Temperature Performance

Abstract ALAR 00.12 is a 12% silicon-aluminum casting alloy having high corrosion resistance. It is suitable for pressure-tight and thin-wall castings. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Al-45. Producer or source: Wolverhampton Metal Company Ltd.

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