Quadrilateral Elements

As a connecting component of tubes, the elbow is indispensable to pipe-fitting in composite products. Previous studies have addressed methods for generating winding paths based on parametric equations on the elbow. However, these methods are unsuitable for elbows whose surfaces are difficult to describe using mathematical expressions. In this study, a geometric method was proposed for generating winding patterns for various elbow types. With this method, the mandrel surface is first converted into uniform and high-quality quadrilateral elements; an algorithm is then provided for calculating the minimum winding angle for bridging-free. Next, an angle for non-bridging was defined as the design-winding angle to generate the uniform and slippage-free basic winding paths on the quadrilateral elements in non-geodesic directions. Finally, after a series of uniform points were calculated on the selected vertical edge according to the elbow type, the pattern paths were generated with the uniform points and basic paths. The proposed method is advantageously not limited to the elbow’s shape.

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Generating quadrilateral elements on plane and over curved surfaces

Computers & Structures ◽

10.1016/0045-7949(89)90389-1 ◽

1989 ◽

Vol 31 (3) ◽

pp. 421-426 ◽

Cited By ~ 42

Author(s):

S.H. Lo

Keyword(s):

Curved Surfaces ◽

Quadrilateral Elements

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Finite Element Mesh Generation of Ship Structures with Quadrilateral Elements around Stress Concentrated Area

Journal of the Society of Naval Architects of Japan ◽

10.2534/jjasnaoe1968.1994.291 ◽

1994 ◽

Vol 1994 (175) ◽

pp. 291-298 ◽

Cited By ~ 1

Author(s):

Yasumi Kawamura ◽

Hideomi Ohtsubo ◽

Katsuyuki Suzuki

Keyword(s):

Finite Element ◽

Mesh Generation ◽

Finite Element Mesh ◽

Ship Structures ◽

Element Mesh ◽

Quadrilateral Elements ◽

Finite Element Mesh Generation

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Numerical Modeling of Air Flow in a Cabinet Dryer Equipped by Deflector Plates

International Journal of Food Engineering ◽

10.1515/ijfe-2018-0341 ◽

2019 ◽

Vol 15 (10) ◽

Author(s):

Omid Reza Roustapour ◽

Hamid Reza Gazor ◽

Kazemi Farzin

Keyword(s):

Fluid Dynamics ◽

Numerical Modeling ◽

Air Flow ◽

Outlet Temperature ◽

Governing Equations ◽

Air Velocity ◽

Drying Time ◽

Elapsed Time ◽

Quadrilateral Elements ◽

Simulation Results

AbstractIn this study, air deflector plates were used in order to increase the air elapsed time in the chamber. The air flow pattern was simulated using computational fluid dynamics. The geometry of the chamber was produced in 2D and meshed by triangular and quadrilateral elements, boundary conditions were defined and the governing equations solved. Modeling of flow without any deflectors depicted the air flowed to the chamber conducted to the outlet without any distortion. Air vortices were generated when the deflectors defined in model. To evaluate the influence of deflectors on drying period, constructed plates installed in the dryer chamber and melon slices were dried when deflectors used or not. Simulation results showed magnitude of the air velocity was increased and temperature uniform distribution developed on the surface of trays. The outlet temperature was also decreased up to 10 % and drying time reduced to 22 % when the deflectors were employed.

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