scholarly journals Multi-Disciplinary Design Optimisation of the Cooled Squealer Tip for High Pressure Turbines

Aerospace ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 116
Author(s):  
Stefano Caloni ◽  
Shahrokh Shahpar ◽  
Vassili Toropov
Keyword(s):  
Stress Level ◽  
Computer Aided Design ◽  
Turbine Rotor ◽  
The Novel ◽  
Design Optimisation ◽  
Aerodynamic Loss ◽  
Computational Fluid Dynamics Cfd ◽  
Multipoint Approximation ◽  
Aided Design ◽  
Novel Design

The turbine tip geometry can significantly alter the performance of the turbine stage; its design represents a challenge for a variety of reasons. Multiple disciplines are involved in its design and their requirements limit the creativity of the designer. Multi-Disciplinary Design Optimisation (MDO) offers the capability to improve the performance whilst satisfying all the design constraints. This paper presents a novel design of a turbine tip achieved via MDO techniques. A fully parametrised Computer-Aided Design (CAD) model of the turbine rotor is used to create the squealer geometry and to control the location of the cooling and dust holes. A Conjugate Heat Transfer Computational Fluid Dynamics (CFD) analysis is performed for evaluating the aerothermal performance of the component and the temperature the turbine operates at. A Finite Element (FE) analysis is then performed to find the stress level that the turbine has to withstand. A bi-objective optimisation reduces simultaneously the aerodynamic loss and the stress level. The Multipoint Approximation Method (MAM) recently enhanced for multi-objective problems is chosen to solve this optimisation problem. The paper presents its logic in detail. The novel geometry offers a significant improvement in the aerodynamic performance whilst reducing the maximum stress. The flow associated with the new geometry is analysed in detail to understand the source of the improvement.

Evaluation of the Adhesion of a Novel Design of Veneers to Dental Materials

2017 ◽  
Vol 68 (9) ◽  
pp. 2125-2128
Author(s):  
Alexandra Cristina Maroiu ◽  
Cosmin Sinescu ◽  
Radu Negru ◽  
Liviu Marsavina ◽  
Ioana Delia Bretean ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
High Performance ◽  
Dental Materials ◽  
In Vitro Study ◽  
The Novel ◽  
Adhesive Properties ◽  
Computer Aided ◽  
Aided Design ◽  
Novel Design

The aim of this in vitro study was to assess a new design that, to our knowledge, we have introduced (patent pending) for indirect dental veneers. Their effect on the retention and adhesive properties at their interfaces have been studied. Fourteen high performance polymeric (PEEK) dental veneers have been elaborated using a computer-aided-design (CAD) software and then milled using a computer-aided-machine (CAM). They were divided in two experimental groups: seven classical veneers with a liniar marginal contour and seven dental veneers with the novel proposed sinusoidal marginal design. All the samples have been bonded to polymeric blocks that had the vestibular face prepared in a specific way for each group. The values of the retention and adhesive forces were tested in vitro by applying bending forces on the incisal edge of the veneers, from the oral to the vestibular direction. A 50% increase of the values of these forces for the novel design with regard to the classical one has been demonstrated through the study.

scholarly journals Comparison of Computer Extended Descriptive Geometry (CeDG) with CAD in the Modeling of Sheet Metal Patterns

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 685
Author(s):  
Manuel Prado-Velasco ◽  
Rafael Ortiz-Marín
Keyword(s):  
Sheet Metal ◽  
Computer Aided Design ◽  
Parametric Modeling ◽  
Descriptive Geometry ◽  
The Novel ◽  
Forming Process ◽  
Solid Models ◽  
Design Software ◽  
Solid Edge ◽  
Aided Design

The emergence of computer-aided design (CAD) has propelled the evolution of the sheet metal engineering field. Sheet metal design software tools include parameters associated to the part’s forming process during the pattern drawing calculation. Current methods avoid the calculation of a first pattern drawing of the flattened part’s neutral surface, independent of the forming process, leading to several methodological limitations. The study evaluates the reliability of the Computer Extended Descriptive Geometry (CeDG) approach to surpass those limitations. Three study cases that cover a significative range of sheet metal systems are defined and the associated solid models and patterns’ drawings are computed through Geogebra-based CeDG and two selected CAD tools (Solid Edge 2020, LogiTRACE v14), with the aim of comparing their reliability and accuracy. Our results pointed to several methodological lacks in LogiTRACE and Solid Edge that prevented to solve properly several study cases. In opposition, the novel CeDG approach for the computer parametric modeling of 3D geometric systems overcame those limitations so that all models could be built and flattened with accuracy and without methodological limitations. As additional conclusion, the success of CeDG suggests the necessity to recover the relevance of descriptive geometry as a key core in graphic engineering.

An Integrated Ship Re-Design/Modification Strategy

2019 ◽  
Vol 161 (A1) ◽  
Keyword(s):  
Computer Aided Design ◽  
Modular Design ◽  
Ship Hull ◽  
Cfd Model ◽  
Hull Form ◽  
Design Modification ◽  
Technical Parameters ◽  
Computational Fluid Dynamics Cfd ◽  
Bulbous Bow ◽  
Aided Design

Herein, we present an integrated ship re-design/modification strategy that integrates the ‘Computer-Aided Design (CAD)’ and ‘Computational Fluid Dynamics (CFD)’ to modify the ship hull form for better performance in resistance. We assume a modular design and the ship hull form modification focuses on the forward module (e.g. bulbous bow) and aft module (e.g. stern bulb) only. The ship hull form CAD model is implemented with NAPA*TM and CFD model is implemented with Shipflow**TM. The basic ship hull form parameters are not changed and the modifications in some of the technical parameters because of re-designed bulbous bow and stern bulb are kept at very minimum. The bulbous bow is re-designed by extending an earlier method (Sharma and Sha (2005b)) and stern bulb parameters for re-design are computed from the experience gained from literature survey. The re-designed hull form is modeled in CAD and is integrated and analyzed with Shipflow**TM. The CAD and CFD integrated model is validated and verified with the ITTC approved recommendations and guidelines. The proposed numerical methodology is implemented on the ship hull form modification of a benchmark ship, i.e. KRISO container ship (KCS). The presented results show that the modified ship hull form of KCS - with only bow and stern modifications - using the present strategy, results into resistance and propulsive improvement.

Novel Active Inflow Control Technology for Optimized Flow and Reduced Intervention

2021 ◽  
pp. 1-12
Author(s):  
Ashutosh Dikshit ◽  
Vivek Agnihotri ◽  
Mike Plooy ◽  
Amrendra Kumar ◽  
Seymur Gurbanov ◽  
...  
Keyword(s):  
Flow Control ◽  
Computer Aided Design ◽  
Process Development ◽  
Horizontal Wells ◽  
Field Trials ◽  
Control Device ◽  
Computational Fluid Dynamics Cfd ◽  
Inflow Control Device ◽  
Aided Design ◽  
Subsequent Intervention

Summary Integrating a flow control sliding sleeve into a sand screen can provide multiple advantages to the user in controlling the production inflow, but it comes with an increased completion cost as well as an increase in the number of interventions required when it is time to operate those valves. Especially in long horizontal wells, this can become time-consuming and inefficient. A few technologies exist to address this issue, but they either are too complex or require specialized rigging equipment at the wellsite, which is not desirable. As described herein, a unique, fit-for-application modular sliding sleeve sand screen assembly with dissolvable plugs was developed that eliminates the need for washpipe during run-in-hole (RIH) and allows flow control from several screens by means of a single sliding sleeve door (SSD), thereby also optimizing the subsequent intervention operations by reducing the number of SSDs in the well. The design and field installation of these modular screens is presented in this paper. The new modular sand screen consisted of an upper joint, modular middle joint, modular middle joint with an inflow control device (ICD) integrated into an SSD (with optional dissolvable plugs), a lower joint, and novel field-installable flow couplings between them. The design allows for any number of non-ICD/SSD screen joints to be connected to any number of ICD/SSD joints in any order. A computer-aided design was followed to achieve all the operational and mechanical requirements. Computational fluid dynamics (CFD) was used to optimize the flow performance characteristics. Prototypes were manufactured and tested before conducting successful field trials. The design process, development, and field installation results are presented herein.

scholarly journals Computational Evaluation of Surgical Design for Multisegmental Complex Congenital Tracheal Stenosis

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Limin Zhu ◽  
Xiaolei Gong ◽  
Jinlong Liu ◽  
Youjin Li ◽  
Yumin Zhong ◽  
...  
Keyword(s):  
Tracheal Stenosis ◽  
Computer Aided Design ◽  
Surgical Correction ◽  
Patient Specific ◽  
Congenital Tracheal Stenosis ◽  
Computational Evaluation ◽  
Life Threatening ◽  
Computational Fluid Dynamics Cfd ◽  
Aerodynamic Parameters ◽  
Aided Design

Multisegmental complex congenital tracheal stenosis (CTS) is an uncommon but potentially life-threatening malformation of the airway. Staged surgery is indicated for the complex pathophysiology of the abnormal trachea. Surgical intervention to fix the stenotic segments may result in different postoperative outcomes. However, only few studies reported the design of surgical correction for multisegmental CTS. We used computer-aided design (CAD) to simulate surgical correction under different schemes to develop a patient-specific tracheal model with two segmental stenoses. Computational fluid dynamics (CFD) was used to compare the outcomes of different designs. Aerodynamic parameters of the trachea were evaluated. An obvious interaction was found between the two segments of stenosis in different surgical designs. The surgical corrective order of stenotic segments greatly affected the aerodynamic parameters and turbulence flows downstream of tracheal stenosis and upstream of the bronchus. Patient-specific studies using CAD and CFD minimize the risk of staged surgical correction and facilitate quantitative evaluation of surgical design for multiple segments of complex CTS.

scholarly journals Design and Analyses of a Transdermal Drug Delivery Device (TD3) †

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5090 ◽  
Author(s):  
Jennifer García ◽  
Ismael Ríos ◽  
Faruk Fonthal Rico
Keyword(s):  
Drug Delivery ◽  
Transdermal Drug Delivery ◽  
Computer Aided Design ◽  
Micro Electro Mechanical System ◽  
Discharge Process ◽  
Microneedle Array ◽  
Delivery Device ◽  
Drug Delivery Device ◽  
Computational Fluid Dynamics Cfd ◽  
Aided Design

In this paper, we introduce a novel type of transdermal drug delivery device (TD3) with a micro-electro-mechanical system (MEMS) design using computer-aided design (CAD) techniques as well as computational fluid dynamics (CFD) simulations regarding the fluid interaction inside the device during the actuation process. For the actuation principles of the chamber and microvalve, both thermopneumatic and piezoelectric principles are employed respectively, originating that the design perfectly integrates those principles through two different components, such as a micropump with integrated microvalves and a microneedle array. The TD3 has shown to be capable of delivering a volumetric flow of 2.92 × 10−5 cm3/s with a 6.6 Hz membrane stroke frequency. The device only needs 116 Pa to complete the suction process and 2560 Pa to complete the discharge process. A 38-microneedle array with 450 µm in length fulfills the function of permeating skin, allowing that the fluid reaches the desired destination and avoiding any possible pain during the insertion.

Prometheus: A Geometry-Centric Optimization System for Combustor Design

2014 ◽  
Author(s):  
Xu Zhang ◽  
David J. J. Toal ◽  
Neil W. Bressloff ◽  
Andy J. Keane ◽  
Frederic Witham ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Gas Turbine ◽  
Computer Aided Design ◽  
Design System ◽  
Gas Turbine Combustor ◽  
Computer Aided ◽  
Computational Fluid Dynamics Cfd ◽  
Automatic Mesh ◽  
Aided Design

The following paper presents an overview of the Prometheus design system and its applications to gas turbine combustor design. Unlike a traditional “optimizer-centric” method, Prometheus aims to reduce both the level of workflow complexity and rework by taking a more “geometry-centric” approach to design optimization by shifting the control of script generation away from the optimization program to the computer aided design (CAD) package. Prometheus therefore enables significant geometry changes to be automatically reflected in all subsequent scripts necessary for the analysis of a combustor. Prometheus’ current capabilities include automatic fluid volume generation and aero-thermal and thermo-acoustic network generation as well as automatic mesh and computational fluid dynamics (CFD) script generation.

scholarly journals Ask the Supercomputer

2006 ◽  
Vol 128 (04) ◽  
pp. 36-38
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
Research Work ◽  
Associate Professor ◽  
Complex Flows ◽  
Heart Pump ◽  
Model Complex ◽  
Computational Fluid Dynamics Cfd ◽  
Rice University ◽  
And Performance ◽  
Aided Design

This paper analyzes research work on developing techniques to study complex fluids. Although several computational fluid dynamics (CFD) vendors now sell desktop software that mechanical engineers can buy to model complex flows, many problems are still simply too hard for those applications. According to engineers, CFD programs for these complex problems can take years to write, even with the supercomputer's aid. Moreover, some flows may never be modeled: they are just too complex for even the most advanced software. Behr and a colleague, Matteo Pasquali, an Associate Professor in the Department of Chemical and Biomolecular Engineering at Rice University, are now at work writing a CFD application that will help a heart-pump manufacturer analyze how blood would move through different configurations of the pump. Pasquali and Behr spent two years trying to turn the pump geometry and performance data Baylor provided into usable data. They converted the pump's computer-aided design information and input it into their homegrown CFD program, then came up with software tools to rotate one part of the computationally meshed pump element with respect to another.

Preliminary Design and Analysis Tool for Aeroengine Turbine Fixings

2014 ◽  
Author(s):  
Abdulhalim Twahir ◽  
François Roy ◽  
Magdy Attia ◽  
Hany Moustapha
Keyword(s):  
Computer Aided Design ◽  
Structural Integrity ◽  
Turbine Rotor ◽  
Analysis Tool ◽  
Preliminary Design ◽  
Element Analysis ◽  
Batch Mode ◽  
Previous Design ◽  
Time Savings ◽  
Aided Design

A single platform D&A (Design & Analysis) tool is outlined in this paper that allows a user, through a single GUI (Graphical User Interface), to create a turbine rotor fixing as well as analyze the structural integrity of the fixing. This is done through the integration of CAD (Computer Aided Design) and FEA (Finite Element Analysis) software running in batch mode, driven by the GUI. This SPIE (Single Platform Integration Environment) captures the strength of CAD software to create a fully parameterized fixing that is able to model legacy, current designs and provides flexibility to design fixings not yet conceived. Using the automated use of FEA software through a secure and reliable gateway, stress analysis can be performed and the results displayed back to the user through the GUI. This tool provides a significant increase in quality and time savings to design a fixing when compared to the previous design methodologies. What used to take hours to design and analyze through the use of isolated specialist built and owned tools with little communication between them and non-ideal data management, now takes minutes; a reduction of up to 10 fold in the time taken.

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