Design of Non-Isothermal T-Shaped Microreactors with Engulfment Flow by Using a Simplified Model

2011 ◽  
Vol 396-398 ◽  
pp. 1033-1038
Author(s):  
Lin Wang ◽  
Shinya Kawamura ◽  
Osamu Tonomura ◽  
Shinji Hasebe
Keyword(s):  
Optimal Design ◽  
Three Dimensional ◽  
Product Yield ◽  
Driving Pressure ◽  
Dynamics Model ◽  
Design Problems ◽  
Computational Fluid Dynamics Model ◽  
Design Result ◽  
Considerable Concern

T-shaped microreactors (T-MRs) with engulfment flow can increase product yield but their high driving pressure is a considerable concern to engineers. Thus, it is important to design a T-MR that can give maximum product yield within a limitation on driving pressure. The use of computational fluid dynamics model is not practical for optimal design of T-MRs due to its heavy computational load. In this research, an extended pseudo three-dimensional lamellar model (eP3DLAM) is proposed as a simple model of non-isothermal T-MRs to efficiently solve the optimal design problems. The usefulness of eP3DLAM is evaluated through a case study on T-MR design. The design result shows that eP3DLAM can accurately predict the concentration and temperature distributions in T-MRs and that the design period of T-MRs can be drastically reduced by using eP3DLAM.

Case Study of an Application of a Computational Fluid Dynamics Model to the Forebay of the Dalles Dam, Oregon

2008 ◽  
Vol 134 (5) ◽  
pp. 509-519 ◽  
Author(s):  
Liaqat A. Khan ◽  
Edward A. Wicklein ◽  
Mizan Rashid ◽  
Laurie L. Ebner ◽  
Natalie A. Richards
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Dynamics Model ◽  
Computational Fluid Dynamics Model

A personalized mandibular implant with supporting and porous structures designed with topology optimization – a case study of canine

2019 ◽  
Vol 25 (2) ◽  
pp. 417-426 ◽  
Author(s):  
Kangjie Cheng ◽  
Yunfeng Liu ◽  
Chunyan Yao ◽  
Wenquan Zhao ◽  
Xu Xu
Keyword(s):  
Topology Optimization ◽  
Optimal Design ◽  
Three Dimensional ◽  
Fem Analysis ◽  
Von Mises Stress ◽  
Content Type ◽  
Optimized Model ◽  
Supporting Structures ◽  
External Shape

Purpose The purpose of this study is to obtain a titanium mandibular implant that possesses a personalized external shape for appearance recovery, a supporting structure for physiological loading and numerous micro-pores for accelerating osseointegration. Design/methodology/approach A three-dimensional intact mandibular model of a beagle dog was created from cone-beam computerized tomography scans. A segment of the lower jaw bone was resected and replaced by a personalized implant with comprehensive structures including a customized external shape, supporting structures and micro-pores, which were designed by topology optimization. Then with FEM analysis, the stress, displacement distribution and compliance of the designed implant were compared with the non-optimized model. The weight of the optimized implant that was fabricated by SLM with titanium alloy powder was measured and contrasted with the predicted non-optimized model for evaluating the viability of the design. Findings The FEM results showed the peaks of von Mises stress and displacement on the optimized implant were much lower than those of the implant without optimization. With topology optimization, the compliance of the implant decreased significantly by 53.3 per cent, and a weight reduction of 37.2 per cent could be noticed. Originality/value A design strategy for personalized implant, with comprehensive structures and SLM as the fabrication method, has been developed and validated by taking a canine mandible as the case study. With comprehensive structures, the implant presented good biomechanical behaviors thanks to the most appropriate supporting structures obtained by optimal design. The topological optimal design combined with SLM printing proved to be an effective method for the design and fabrication of personalized implant with complex structures.

Development of an Intermediate Degree of Freedom Vehicle Dynamics Model for Optimal Design Studies

2000 ◽  
Author(s):  
Erik M. Lowndes ◽  
J. W. David
Keyword(s):  
Optimal Design ◽  
Vehicle Dynamics ◽  
Control Algorithm ◽  
Three Dimensional ◽  
Dynamics Model ◽  
Design Studies ◽  
Vehicle Simulation ◽  
Race Car ◽  
Sufficient Detail ◽  
Intermediate Degree

Abstract Today’s race teams spend a significant amount of time and money performing on-track testing of their vehicles in order to determine the best possible suspension configuration for a particular racing venue. The use of computer simulation coupled with optimal design techniques presents the opportunity to significantly reduce the amount of on-track testing required. Many of the existing vehicle simulation codes are not suitable for application to the optimal design problem, either because they incorporate too much detail and run too slowly, or because they lack sufficient detail. A new model that bridges the gap between these two existing classes of models and is suitable for performing optimal design has been developed. The vehicle model is fully three dimensional and nonlinear. A driver control algorithm was developed that is capable of driving the car near it’s handling limits. An attempt was made to optimize the suspension setup for the NCSU Legends race car.

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