• 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 

  Fernández-Navamuel, A.; Zamora-Sánchez, D.; Varona-Poncela, T.; Jiménez-Fernández, C.; Díez-Hernández, J.; García-Sánchez, D. (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 ...

• Sensitivity Analysis for the Appraisal of Hydrofractures in Horizontal Wells with Borehole Resistivity Measurements 

  Pardo, D.; Torres-Verdín, C. (2013-06)

  This paper numerically evaluates the possibility of using borehole electromagnetic (EM) measurements to diagnose and quantify hydraulic fractures that have been arti ficially generated in a horizontal well. Hydrofractures ...

• A Simulation Method for the Computation of the E 

  Omella, A. J.; Alvarez-Aramberri, J.; Strugaru, M.; Darrigrand, V.; Pardo, D.; Gonzalez, H.; Santos, C. (2021-03)

  We propose a set of numerical methods for the computation of the frequency-dependent eff ective primary wave velocity of heterogeneous rocks. We assume the rocks' internal microstructure is given by micro-computed tomography ...

• Goal-oriented adaptivity for a conforming residual minimization method in a dual discontinuous Galerkin norm 

  Rojas, S.; Pardo, D.; Behnoudfare, P.; Calo, V. M. (2021-03)

  We propose a goal-oriented mesh-adaptive algorithm for a finite element method stabilized via residual minimization on dual discontinuous-Galerkin norms. By solving a saddle-point problem, this residual minimization delivers ...

• A conservative lubrication dynamics method for the simulation of dense non-colloidal suspensions with particle spin 

  Kumar, S.S.P.; Vazquez-Quesada, A.; Ellero, M. (2021-02-15)

  In this paper, a novel Fast Lubrication Dynamics method that can efficiently simulate dense non-colloidal suspensions is proposed. To reduce the computational cost in the presented methodology, interparticle lubrication-based ...

• Rational approximation of P-wave kinematics — Part 2: Orhorhombic media 

  Abedi, M.M. (2020-09)

  Orthorhombic anisotropy is a modern standard for 3D seismic studies in complex geologic settings. Several seismic data processing methods and wave propagation modeling algorithms in orthorhombic media rely on phase-velocity, ...

• A new acoustic assumption for orthorhombic media 

  Abedi, M.M.; Stovas, A. (2020-11)

  In exploration seismology, the acquisition, processing and inversion of P-wave data is a routine. However, in orthorhombic anisotropic media, the governing equations that describe the P-wave propagation are coupled with ...

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