Computational Mathematics (CM)
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Deep learning driven self-adaptive hp finite element method
Paszyński, M.; Grzeszczuk, R.; Pardo, D.
; Demkowicz, L. (2021-06)
The fi nite element method (FEM) is a popular tool for solving engineering problems governed by Partial Di fferential Equations (PDEs). The accuracy of the numerical solution depends on the quality of the computational ... -
Large-offset P-wave traveltime in layered transversely isotropic media
Abedi, M.M.; Pardo, D. (2021-05-01)
Large-offset seismic data processing, imaging, and velocity estimation require an accurate traveltime approximation over a wide range of offsets. In layered transversely isotropic media with a vertical symmetry axis, the ... -
Metallic microswimmers driven up the wall by gravity
Brosseau, Quentin; Balboa, F.; Lushi, Enkeleida; Wu, Yang; Ristroph, Leif; Ward, Michael D.; Shelley, Michael J.; Zhang, Jun (2021-07-21)
Experiments on autophoretic bimetallic nanorods propelling within a fuel of hydrogen peroxide show that tail-heavy swimmers preferentially orient upwards and ascend along inclined planes. We show that such gravitaxis is ... -
On isoptics and isochordal-viewed curves
(2021)In this paper, some results involving isoptic curves and constant $\phi$-width curves are given for any closed curve. The non-convex case, as well as non-simple shapes with or without cusps are considered. Relating the ... -
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 ... -
Geometry and tool motion planning for curvature adapted CNC machining
Barton, M.; Bizzarri, M.; Rist, F.; Sliusarenko, O.; Pottmann, H. (2021)
CNC machining is the leading subtractive manufacturing technology. Although it is in use since decades, it is far from fully solved and still a rich source for challenging problems in geometric computing. We demonstrate ... -
Fast Simulation of 2.5D LWD Resistivity Tools
Rodríguez-Rozas, A.; Pardo, D.; Torres-Verdín, C. (2017-06)
As a first step towards the fast inversion of geophysical data, in this work we focus on the rapid simulations of 2.5D logging-while-drilling (LWD) borehole resistivity measurements. Given a commercial logging instrument ... -
3D hp-Adaptive Finite Element Simulations of Bend, Step, and Magic-T Electromagnetic Waveguide Structures
Gomez-Revuelto, I.; Garcia-Castillo, L.E.; Llorente-Romano, S.; Pardo, D. (2014-03)
Metallic rectangular waveguides are often the preferred choice on telecommunication systems and medical equipment working on the upper microwave and millimeter wave frequency bands due to the simplicity of its geometry, ... -
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 ... -
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 ... -
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) ... -
Dynamics and rheology of a suspension of super-paramagnetic chains under the combined effect of a shear flow and a rotating magnetic field
Rossi, E.; Ruiz-Lopez, J.A.; Vazquez-Quesada, A.; Ellero, M. (2021)
This study presents an analysis of the dynamics of a single and multiple chains of spherical super-paramagnetic beads suspended in a Newtonian fluid under the combined effect of an external rotating magnetic field and a ... -
Compensation effect analysis in DIE method for through-casing measuring formation resistivity
Qing, C.; Pardo, D.; Hong-bin, L.; Fu-rong, W. (2011-08)
The measuring technique based on Double-Injection-Electrodes (DIE) and its compensation arithmetic method have been proven to be very useful for eliminating the errors caused by electrode-scale mechanical tolerances in ... -
Vibration-based SHM strategy for a real time alert system with damage location and quantification
(2021-01)We present a simple and fully automatable vibration-based Structural Health Monitoring (SHM) alert system. The proposed method consists in applying an Automated Frequency Domain Decomposition (AFDD) algorithm to obtain the ... -
A Quadrature-Free Method for Simulation and Inversion of 1.5D Direct Current (DC) Borehole Measurements
Rojas, S.; Muga, I.; Pardo, D. (2016-12)
Resistivity inverse problems are routinely solved in order to characterize hydrocarbon bearing formations. They often require a large number of forward problems simulations. When considering a one dimensional (1D) planarly ... -
FAST AND AUTOMATIC INVERSION OF LWD RESISTIVITY MEASUREMENTS FOR PETROPHYSICAL INTERPRETATION
Pardo, D.; Torres-Verdín, C.; Ali Bakr, S. (2015-07)
This paper describes an extension of a recently developed fast inversion method (Pardo and Torres-VerdÍn (2015)) for estimating a layer-by-layer electric resistivity distribution from logging-whiledrilling (LWD) electromagnetic ... -
1.5D BASED INVERSION OF LOGGING-WHILE-DRILLING RESISTIVITY MEASUREMENTS IN 3D FORMATIONS
Pardo, D.; Torres-Verdín, C. (2017-06)
This manuscript describes an extension of a computer method developed for the fast inversion of logging-while-drilling (LWD) resistivity measurements Pardo and Torres-Verdín (2015); Bakr et al. (2016). The method enables ... -
Fast 1D Inversion of Logging-While-Drilling Resistivity Measurements for Improved Estimation of Formation Resistivity in High-Angle and Horizontal Wells
Pardo, D.; Torres-Verdín, C. (2014-12)
We have developed an efficient inversion method to estimate layer-by-layer electric resistivity from loggingwhile-drilling electromagnetic induction measurements. The method assumes a 1D model based on planarly layered ... -
Influence of borehole-eccentred tools on wireline and logging-while-drilling sonic logging measurements
Pardo, D.; Matuszyky, P.; Torres-Verdín, C.; Mora, A.; Muga, I. (2013-06)
We describe a numerical study to quantify the influence of tool-eccentricity on wireline and logging-while-drilling (LWD) sonic logging measurements. Simulations are performed with a hp-adaptive Fourier Finite-Element ... -
New post processing method for interpretation of through casing resistivity (TCR) measurements
Qing, C.; Pardo, D.; Hong-bin, L. (2011-03)
We propose a new iterative method for post processing through casing resistivity (TCR) measurements. This method can be seen as a correction or extension of Kaufman´s theory to more complex scenarios, in which the casing ...
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