Results 81 to 90 of about 5,254 (164)

The continuous adjoint method to the γ−R˜eθt$$ \gamma -\tilde{R}{e}_{\theta t} $$ transition model coupled with the Spalart–Allmaras model for compressible flows

International Journal for Numerical Methods in Fluids, Volume 96, Issue 11, Page 1715-1740, November 2024.
The continuous adjoint method for transitional flows of compressible fluids was developed and assessed in aerodynamic shape optimization problems, based on three variants of the γ−R˜eθt$$ \gamma -\tilde{R}{e}_{\theta t} $$ transition model. The differentiation of the transition model ensures the accurate computation of the sensitivity derivatives when ...
Marina G. Kontou, Xenofon S. Trompoukis, Varvara G. Asouti, Kyriakos C. Giannakoglou   +3 more
wiley   +1 more source

Adaptive 2D IGA boundary element methods

, 2015
We derive and discuss a posteriori error estimators for Galerkin and collocation IGA boundary element methods for weakly-singular integral equations of the first-kind in 2D.
Feischl, Michael, Gantner, Gregor, Haberl, Alexander, Praetorius, Dirk   +3 more
core   +2 more sources

Gradient‐based eigenvalue optimization for electromagnetic cavities with built‐in mode matching

IET Science, Measurement &Technology, Volume 18, Issue 9, Page 462-470, November 2024.
Shape optimization with respect to eigenvalues of a cavity plays an important role in the design of new resonators or in the optimization of existing ones. This paper proposes a gradient‐based optimization scheme, which is enhanced with closed‐form shape derivatives of the system matrices. Based on these, accurate derivatives of eigenvalues, eigenmodes,
Anna Ziegler, Robert Hahn, Victoria Isensee, Anh Duc Nguyen, Sebastian Schöps   +4 more
wiley   +1 more source

A projection‐based quaternion discretization of the geometrically exact beam model

International Journal for Numerical Methods in Engineering, Volume 125, Issue 20, 30 October 2024.
Abstract In the present work the geometrically exact beam model is formulated in terms of unit quaternions. A projection‐based discretization approach is proposed which is based on a normalization of the quaternion approximation. The discretization relies on NURBS shape functions and, alternatively, on Lagrangian interpolation.
Paul Wasmer, Peter Betsch
wiley   +1 more source

Feed Rate-Adaptive Predictive PH Interpolation for Real-Time NURBS Toolpath Execution in High-Speed CNC Machining

Measurement Science Review
This study presents a novel feed rate-adaptive predictive interpolation algorithm that combines Pythagorean-hodograph (PH) curves with non-uniform rational b-splines (NURBS) to improve real-time toolpath generation in high-speed CNC machining.
Tian Guosheng
doaj   +1 more source

Testing the Effectiveness of Voxels for Structural Analysis

Algorithms
To assess the condition of cultural heritage assets for conservation, reality-based 3D models can be analyzed using FEA (finite element analysis) software, yielding valuable insights into their structural integrity.
Sara Gonizzi Barsanti, Ernesto Nappi
doaj   +1 more source

An integrated design-analysis framework for three dimensional composite panels [PDF]

, 2014
We present an integrated design-analysis framework for three dimensional composite panels. The main components of the proposed framework consist of (1) a new curve/surface offset algorithm and (2) the isogeometric concept recently emerged in the ...
Bordas, Stéphane, Kerfriden, Pierre, Nguyen, Vinh-Phu, Rabczuk, Timon   +3 more
core  

Matrix-free weighted quadrature for a computationally efficient isogeometric $k$-method

, 2018
The $k$-method is the isogeometric method based on splines (or NURBS, etc.) with maximum regularity. When implemented following the paradigms of classical finite element methods, the computational resources required by the $k-$method are prohibitive even
Sangalli, Giancarlo, Tani, Mattia
core   +1 more source

A Soft‐Tissue Driven Bone Remodeling Algorithm for Mandibular Residual Ridge Resorption Based on Patient CT Image Data

Advanced Healthcare Materials, Volume 13, Issue 22, September 1, 2024.
The interplay between biomechanical stimulation from soft tissue and adjacent hard tissue remodeling, such as residual ridge resorption (RRR) in overdenture wearers, remains understudied. Here, using multidisciplinary techniques, the relationship between the biomechanical stimuli within the mucosa and RRR is quantitatively elucidated for the first time.
Jingxiao Zhong, Wenwei Huang, Rohana Ahmad, Junning Chen, Chi Wu, Jingrui Hu, Keke Zheng, Michael V. Swain, Qing Li   +8 more
wiley   +1 more source

Immersing NURBS for CFD applications

, 2013
International audienceWe present a new immersed method for solving conjugate heat transfer and fluid-solid interactions (FSI). It is based on the use of Non Uniform Rational B-Splines (NURBS) to compute the distance function ans thus representing the ...
Coupez, Thierry, Hachem, Elie, Jannoun, Ghina, Veysset, Jérémy   +3 more
core   +1 more source