Three-dimensional model simulation and reconstruction of composite total maxillectomy defects with fibula osteomyocutaneous flap flow-through from radial forearm flap

2009 ◽  
Vol 108 (6) ◽  
pp. e6-e12 ◽  
Author(s):  
Yue He ◽  
Han guang Zhu ◽  
Zhi yuan Zhang ◽  
Jie He ◽  
Robert Sader
Keyword(s):  
Model Simulation ◽  
Three Dimensional ◽  
Radial Forearm Flap ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Forearm Flap ◽  
Total Maxillectomy ◽  
Radial Forearm ◽  
Flow Through

Three-Dimensional Magnetic Resonance Imaging Volumetry of Radial Forearm Flap Reconstructions After Craniomaxillofacial Tumor Resection

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Philipp Thoenissen ◽  
Anja Heselich ◽  
Robert Sader ◽  
Thomas Joseph Vogl ◽  
Shahram Ghanaati ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Tumor Resection ◽  
Three Dimensional ◽  
Radial Forearm Flap ◽  
Resonance Imaging ◽  
Forearm Flap ◽  
Radial Forearm

Applicability of Axisymmetric Analysis in Predicting Supersonic Flow Through Annular Cascades

1977 ◽  
Vol 99 (1) ◽  
pp. 115-120
Author(s):  
Hans-Heiner Fruehauf
Keyword(s):  
Supersonic Flow ◽  
Differential Equations ◽  
Three Dimensional ◽  
Supersonic Flows ◽  
Dimensional Model ◽  
Surfaces Of Revolution ◽  
Three Dimensional Model ◽  
Dynamical Parameters ◽  
Flow Through ◽  
Blade Model

Solutions of the differential equations of the axisymmetric model and circumferentially averaged solutions of the differential equations of the three-dimensional model are compared quantitatively for steady supersonic flows through rotating annular cascades. Thereby three-dimensional corrections for flow quantities, which determine the applicability of the axisymmetric analysis, are investigated as a function of geometrical and gas dynamical parameters. Finally, these three-dimensional corrections are compared to three-dimensional corrections for the solutions of the usual blade-to-blade model on cylindrical surfaces of revolution for identical annular cascades.

scholarly journals Objective Selection Criteria between ALT and Radial Forearm Flap in Oral Soft Tissues Reconstruction

2019 ◽  
Vol 52 (02) ◽  
pp. 166-170 ◽  
Author(s):  
Elisa Benanti ◽  
Marta Starnoni ◽  
Antonio Spaggiari ◽  
Massimo Pinelli ◽  
Giorgio De Santis
Keyword(s):  
Soft Tissues ◽  
Three Dimensional ◽  
Perforator Flap ◽  
Free Flaps ◽  
Radial Forearm Flap ◽  
Life Questionnaire ◽  
Forearm Flap ◽  
First Choice ◽  
Radial Forearm ◽  
Magnetic Resonance Imaging Mri

AbstractDifferent locoregional and free flaps were described for oral soft tissues reconstruction after oncological resections; however, free flaps remain the first choice. Among free flaps, the radial forearm flap (RFF) and the anterolateral thigh perforator flap (ALT) are preferred the most. The lack of standardization of the flap choice leaves the selection to the surgeon's experience. The purpose of our observational study is to provide an algorithm to support the flap choice for the reconstruction of oral soft tissues. Sixty patients with squamous cell carcinoma of oral soft tissues were enrolled in our study. All the patients underwent preoperative magnetic resonance imaging (MRI) to measure the three-dimensional size of the tumor. During the follow-up, the patients were evaluated by using the University of Washington-Quality of Life Questionnaire. The questionnaire score was better for small tumors and worse for large tumors in both functional and relational fields. We observed that most of the overlapping results were obtained for small defects and the choice of RFF, as well as for large defects and the use of ALT. We observed that in the preoperative time, it is possible to select which flap between radial forearm and ALT is more appropriate for oral soft tissues defects reconstruction, according to the size of the tumor evaluated by MRI. We propose a decisional algorithm that suggests the type of flap to use between ALT and RFF.

Numerical Modeling of Non-Newtonian Fluid Flow in a Porous Medium Using a Three-Dimensional Periodic Array

1998 ◽  
Vol 120 (1) ◽  
pp. 131-135 ◽  
Author(s):  
Masahiko Inoue ◽  
Akira Nakayama
Keyword(s):  
Porous Medium ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Pressure Gradient ◽  
Newtonian Fluid ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Inertia Effects ◽  
Flow Through

Three-dimensional numerical experiments have been conducted to investigate the viscous and porous inertia effects on the pressure drop in a non-Newtonian fluid flow through a porous medium. A collection of cubes placed in a region of infinite extent has been proposed as a three-dimensional model of microscopic porous structure. A full set of three-dimensional momentum equations is treated along with the continuity equation at a pore scale, so as to simulate a flow through an infinite number of obstacles arranged in a regular pattern. The microscopic numerical results, thus obtained, are processed to extract the macroscopic relationship between the pressure gradient-mass flow rate. The modified permeability determined by reading the intercept value in the plot showing the dimensionless pressure gradient versus Reynolds number closely follows Christopher and Middleman’s formula based on a hydraulic radius concept. Upon comparing the results based on the two- and three-dimensional models, it has been found that only the three-dimensional model can capture the porous inertia effects on the pressure drop, correctly. The resulting expression for the porous inertia possesses the same functional form as Ergun’s, but its level is found to be only one third of Ergun’s.

Numerical Simulation on Solidification of Flow inside an Elliptical Pipe

2015 ◽  
Vol 799-800 ◽  
pp. 751-755
Author(s):  
Lan Li ◽  
Huan Ma ◽  
Feng Qi Si ◽  
Kang Ping Zhu
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Three Dimensional ◽  
Short Axis ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Axis Direction ◽  
Lower Reynolds Number ◽  
Flow Through

The aim of this investigation is to study the characteristics of solidification of flow through an elliptical pipe and to avoid the solidification and blockage in the pipe. A three-dimensional model has been completed using the commercial fluid dynamics code, Fluent. Analyses under different conditions show that different factors affect the characteristics of solidification and heat transfer in the pipe. The lower Reynolds number is or the higher dimensionless wall temperature turns, the thicker the ice layer becomes, which will increase the risk of blockage. The thickness at the long axis direction will grow with the increase of ellipse aspect ratio while it turns out contrary at short axis direction.

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