Recent Submissions

• Thermal and fluid dynamic analysis of Direct Steam Generation Parabolic Trough Collectors 

  Ferchichi, Souha; Kessentini, Hamdi; Morales Ruíz, Sergio; Rigola Serrano, Joaquim; Bouden, Chiheb; Oliva Llena, Asensio (Elsevier, 2019-09-15)
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  Direct Steam Generation (DSG) has attracted considerable attention in comparison with conventional technologies based on Heat Transfer Fluids (HTF) for electricity generation due to its higher temperatures. In this context, ...
• A level-set model for mass transfer in bubbly flows 

  Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2019-08-01)
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  A level-set model is presented for simulating mass transfer or heat transfer in two-phase flows. The Navier-Stokes equations and mass transfer (or heat transfer) equation are discretized using a finite volume method on a ...
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  Experimental investigation of inlet distortion effect on performance of a micro gas turbine 

  Naseri, Alireza; Sammak, Shervin; Boroomand, Masoud; Alihosseini, Alireza; Tousi, Abolghasem M. (2018-09-01)
  Article
  Open Access

  An experimental study has been carried out to determine how inlet total-pressure distortion affects the performance of a micro gas turbine. An inlet simulator is designed and developed to produce and measure distortion ...
• A time-average filtering technique to improve the efficiency of two-layer wall models for large eddy simulation in complex geometries 

  Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Elsevier, 2019-06-30)
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  Two-Layer wall models have been recurrently studied since they represent a good physical model for Large Eddy Simulations with underresolved wall regions. Specifically, those based on the Reynolds Averaged Navier-Stokes ...
• A second-order time accurate semi-implicit method for fluid–structure interaction problems 

  Naseri, Alireza; González Acedo, Ignacio; Amani, Ahmad; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2019-04-01)
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  This paper is concerned with numerical solution of fluid-structure inter-action (FSI) problems involving an incompressible viscous flow and an elasticstructure. A semi-implicit partitioned method with second-order ...
• Numerical study of binary droplets collision in the main collision regimes 

  Amani, Ahmad; Balcázar Arciniega, Néstor; Gutiérrez Álvarez, Enrique; Oliva Llena, Asensio (2019-08-15)
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  Direct numerical simulation of binary droplets collision is done using a conservative level-set method. The Navier-Stokes and level-set equations are solved using a finite-volume method on collocated grids. A novel lamella ...
• Numerical study of rising bubbles with path instability using conservative level-set and adaptive mesh refinement 

  Antepara Zambrano, Óscar; Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2019-06-15)
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  This paper focuses on three-dimensional direct numerical simulations of rising bubbles in the wobbling regime, and the study of its dynamical behavior for Eötvös number 1  ≤  Eo  ≤  10 and Morton number 1e−11  ≤ M ≤  1e−9. ...
• Numerical and experimental study of absorption of H2O vapor in wavy falling film of LiBr aqueous solution in vertical tubes and in presence of non-absorbables 

  García Rivera, Eduardo; Castro González, Jesús; Farnós Baulenas, Joan; Oliet Casasayas, Carles (Elsevier, 2019-04-01)
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  One of the main reasons for the discrepancies between theoretical predictions of absorption phenomena made by mathematical models when they are compared against experimental results under real conditions, are the presence ...
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  On the solution of the problem of a drop falling against a plane by using a level set-moving mesh-immersed boundary method 

  Gutiérrez, Enrique; Favre, F.; Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim (WIT Press, 2018)
  Article
  Open Access

  A coupled Conservative Level Set – Moving Mesh – Immersed Boundary method is formulated and validated against the three-dimensional gravity-driven falling drop problem. First, by employing Conservative Level-Set (CLS) ...
• Numerical approach to study bubbles and drops evolving through complex geometries by using a level set – Moving mesh – Immersed boundary method 

  Gutiérrez González, Ernesto; Favre, F.; Balcázar Arciniega, Néstor; Amani, Ahmad; Rigola Serrano, Joaquim (2018-10-01)
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  The present work proposes a method to study problems of drops and bubbles evolving in complex geometries. First, a conservative level set (CLS) method is enforced to handle the multiphase domain while keeping the mass ...
• Direct numerical simulation of backward-facing step flow at Ret = 395 and expansion ratio 2 

  Pont Vilchez, Arnau; Trias Miquel, Francesc Xavier; Gorobets, Andrey; Oliva Llena, Asensio (2019-03-25)
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  Backward-facing step (BFS) constitutes a canonical configuration to study wallbounded flows subject to massive expansions produced by abrupt changes in geometry. Recirculation flow regions are common in this type of flow, ...
• An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna 

  Favre, F.; Antepara Zambrano, Óscar; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2019-02-05)
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  Considering that the most common reason for electronic component failure is the excessive temperature level, an efficient thermal management design can prolong the operating life of the equipment, while also increasing its ...

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