Calibration of mass transfer models for the numerical prediction of cavitating flow around hydrofoils and marine propellers
The presentation will be focused on the numerical predictions of the cavitating flow around a
hydrofoil and marine propellers. The simulations are carried out using ANSYS-CFX, a commercial CFD (Computational Fluid Dynamics) code, and OpenFOAM, a OpenSource CFD toolbox. The cavitating flow is simulated using a so-called homogeneous model, where the working fluid is treated as a homogeneous mixture of two fluids, i.e water and vapour, behaving as a single one, and the mass transfer rate due to cavitation is regulated by the mass transfer model. Here, three widespread mass transfer models are alternatively used.
Optimization procedures for alternative configurations of risers
The interest in the application of a riser connected to a vessel for exploration and production in deep water, has motivated the need to carefully study this concept due to the high offsets and vertical motions imposed by the vessel at the top of the riser. Petrobras has developed through its Research Center the study of different steel riser configurations. The steel lazy-wave riser (SLWR) has been considered as an adequate solution due to its structural dynamic behavior and costs when compared to other configurations.
Multi objective design optimization of a cargo ship rudder, using the efficiency of the ANSA-modeFRONTIER-META coupling
This paper presents the implementation of an automated process for the definition of a CAE model of a spade rudder with rudder trunk and the strength analysis of it. The automated CAE model set-up capability of ANSA pre-processor is used to define CAE models for static, contact and CFD analyses. ANSA, and μETA post-processor, which is exploited for the extraction of responses from the solver results, are coupled to the modeFRONTIER optimizer for the identification of the best rudder shape.
Shape Optimization of a Monohull Fishing Vessel
This work aims to ship hull shape optimization for multi-objective purpose - resistance and culations. This is carried out on a ﬁshing vessel. Design variations, objectives and constraints are set up according to a naval architect’s speciﬁcations.The work was performed by SIREHNA within the French project COCHISE, led by B.E.Mauric as a naval architect, with the support of the French department for ﬁsheries, together with the OMD2 project supported by the National Agency for Research (ANR).
Coupling efficient multivariate analysis and optimization strategies with an innovative flow solver for hull hydrodynamics
In this work, an innovative flow solver based on OPENFOAM® 1 technology that combines free surface effects with a viscous solution is employed for accurate drag prediction with fast turnaround times ideally suited for an optimization study
Designing Flood Relief Schemes Using Smart Optimization
Automated design space exploration using modeFRONTIER can be applied to real-world wastewater flood relief engineering, moreover significant design time and capital cost savings can thereby be realized. The main aim of this presentation is to prove that a deeper understanding of the sensitivities and performance of wastewater systems may be obtained and it can be done using modeFRONTIER
Efficient Global Optimization for Geomechanical Model Calibration
The presentation proposed by Mathematical Methods & Models for Engineering concerns the solution to the problem of forecasting the displacement of the ground due to seasonal injection and extraction due to Underground Gas Storage (UGS) in a ﬁeld in Lombardia (Italy).
Simulations of the structural behavior of historical constructions
This presentation focuses on simulations of the structural behavior of historical constructions. Nowadays, architects and civil engineers increasingly have to make internal modifications to existing buildings. The modeFRONTIER software application was used to analyze and find the optimal solutions for these alterations.
Research on Optimal Number of Joints and Lengths of Multi-Jointed Robot Arm
The control and trajectory optimization problems of multi-jointed robot arms have been studied in the past, but there are only a few researches on the optimal number of joints and the optimal lengths of such robots. This study deals with the optimization (performed with modeFRONTIER) of the latter aspects, consisting in identifying the optimal number of joints and lengths of a multi-jointed robot arm and minimizing the objective functions under constraints
Optimization of Forging Preforms by Using Pseudo Inverse Approach
In the cold forging process, an initial billet is plastically deformed under a powerful tool pressure. This process changes not only the shape but also the metal’s properties such as the strength, ductility and toughness. Forged parts are often used for high performance and reliability applications.