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+34 946 567 842
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+34 946 567 843
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ahashemian@bcamath.org
Information of interest
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A blackbox optimization of volumetric heating rate for reducing the wetness of the steam flow through turbine blades
Hoseinzade, D.; Lakzian, E.; Hashemian, A.
(2021-01)
This paper proposes to use a blackbox optimization to obtain the optimal volumetric heating required to reduce the wetness at the last stages of steam turbines. For this purpose, a global multiobjective optimization is ...
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Effects of parameterization and knot placement techniques on primal and mixed isogeometric collocation formulations of spatial shear-deformable beams with varying curvature and torsion
Marino, E.; Hosseini, S.F.; Hashemian, A.; Reali, A. (2020-06)
We present a displacement-based and a mixed isogeometric collocation (IGA-C) formulation for free-form, three-dimensional, shear-deformable beams with high and rapidly-varying curvature and torsion. When such complex shapes ...
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Massive Database Generation for 2.5D Borehole Electromagnetic Measurements using Refined Isogeometric Analysis
Hashemian, A.; Garcia, D.; Rivera, J.A.; Pardo, D. (2021-06)
Borehole resistivity measurements are routinely inverted in real-time during geosteering operations. The inversion process can be efficiently performed with the help of advanced artificial intelligence algorithms such as ...
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Numerical Investigation of Wet Inflow in Steam Turbine Cascades Using NURBS-based Mesh Generation Method
Ebrahimi-Fizik, A.; Lakzian, E.; Hashemian, A. (2020)
In this paper, the impact of existence of wetness in the inflow of stationary cascades of steam turbine blades has been numerically investigated. A new mesh generation method based on non-uniform rational B-splines (NURBS) ...
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On the application of isogeometric finite volume method in numerical analysis of wet-steam flow through turbine cascades
Hashemian, A.; Lakzian, E.; Ebrahimi-Fizik, A. (2019-10)
The isogeometric finite volume analysis is utilized in this research to numerically simulate the two-dimensional viscous wet-steam flow between stationary cascades of a steam turbine for the first time. In this approach, ...
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Refined isogeometric analysis for generalized Hermitian eigenproblems
Hashemian, A.; Pardo, D.; Calo, V.M. (2021-04)
We use refined isogeometric analysis (rIGA) to solve generalized Hermitian eigenproblems (Ku = λMu). rIGA conserves the desirable properties of maximum-continuity isogeometric analysis (IGA) while it reduces the solution ...
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Refined isogeometric analysis of quadratic eigenvalue problems
Hashemian, A.; Garcia, D.; Pardo, D.; Calo, V.M. (2022-07-16)
Certain applications that analyze damping effects require the solution of quadratic eigenvalue problems (QEPs). We use refined isogeometric analysis (rIGA) to solve quadratic eigenproblems. rIGA discretization, while ...
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Reparameterization of ruled surfaces: toward generating smooth jerk-minimized toolpaths for multi-axis flank CNC milling
Hashemian, A.; Bo, P.; Barton, M. (2020-05)
This paper presents a novel jerk minimization algorithm in the context of multi-axis flank CNC machining. The toolpath of the milling axis in a flank milling process, a ruled surface, is reparameterized by a B-spline ...
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Studies on knot placement techniques for the geometry construction and the accurate simulation of isogeometric spatial curved beams
Hosseini, S.F.; Hashemian, A.; Reali, A. (2019-11)
The present paper investigates the use of different knot placement techniques for isogeometric analysis of spatial curved beams, to enhance analysis results in cases when geometries are given in terms of data points. ...