Ph.D. students

Vishal Ahuja

Vishal Ahuja Vishal Ahuja, M.Sc.
University of Twente
Faculty of Science and Technology

Carre building, CR 4037
P.O. Box 217
University of Twente
Faculty of Science and Technology

7500 AE Enschede
The Netherlands


Phone: +31-53-489-3544
E-mail: v.r.ahuja@utwente.nl

Education

Sep 2013 - present Ph.D. in Computational Chemical Physics, University of Twente, The Netherlands
Graduation expected in 2018
Supervisors: Prof. Wim Briels, Prof. Jasper van der Gucht
Sep 2011 - Aug 2013 Master of Technology (M.Tech.) - Chemical Engineering, Indian Institute of Technology Bombay (IIT B), India
Supervisor: Prof. S. M. Mahajani
Selectivity Engineering for dimethyl carbonate production using Reactive Distillation
Sep 2007 - Aug 2011 Bachelor of Chemical Engineering (B.Chem.Engg.), Institute of Chemical Technology Mumbai (ICT Mumbai), India
Supervisor: K. V. Marathe
Techno-economic feasibility report for setting up a chemical plant to manufacture calcium para-dodecyl phenolate

Current Research


Vishal's research project is part of the Industrial Partnership Programme (IPP) 'Computational sciences for energy research' of the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organisation for Scientific Research (NWO). This research programme is co-financed by Shell Global Solutions International B.V. The goal of his research is to develop particle-based simulation models for studying flows of complex non-Newtonian fluids such as polymer solutions through porous media. A better understanding of the mechanism can be helpful for a variety of applications including improving the efficiency of polymer flooding operations in Enhanced Oil Recovery.
We have developed a novel coarse-grain particle-based simulation technique called Hydrodynamically Coupled Brownian Dynamics (HCBD), which can be used for modeling self-developing flow of dilute and semi-dilute polymer solutions. Using this technique, one can achieve a two-way coupling between any given Brownian Dynamics based mesoscopic polymer model and the phenomenological fluid model called Smoothed Particle Hydrodynamics. We have constructed the interaction term between the polymers and the fluid blobs in such a way that momentum is conserved locally, thereby preserving long range hydrodynamics. We have applied our technique to study the rheology of model linear polymer solutions. The results show that the polymers and the fluid are coupled very well with each other, showing no lag between their velocities. Furthermore, our results show non-Newtonian shear thinning and the characteristic flattening of the Poiseuille flow profile typically observed for polymer solutions. We are currently working on using this HCBD technique to study flow of viscoelastic polymer solutions through complex geometries. /p>

Publications

  1. V. R. Ahuja, J. van der Gucht and W. J. Briels
    Coarse-grained simulations for flow of complex soft matter fluids in the bulk and in the presence of solid interfaces
    J. Chem. Phys. 145, 194903 (2016). DOI: 10.1063/1.4967422
  2. V. R. Ahuja, J. van der Gucht and W. J. Briels
    Hydrodynamically Coupled Brownian Dynamics: A coarse-grain particle-based Brownian Dynamics technique with hydrodynamic interactions for modeling self-developing flow of polymer solutions
    J. Chem. Phys. 148, 034902 (2018). DOI: 10.1063/1.5006627

Talks

  • Particle-based simulation of flowing visco-elastic fluids
    SoftComp Annual Meeting 2015
    Ancona, Italy (June 2015)
  • Particle-based simulation of flowing visco-elastic fluids
    Burgersdag 2015 - Annual J.M.B.C. Fluid Mechanics Conference
    TU Delft, the Netherlands (January 2015)
  • Particle-based model for flow of complex soft matter fluids
    Soft Matter+ Colloquium
    University of Twente, The Netherlands (November 2016)

Posters

  • Particle-based simulation of flowing visco-elastic fluids
    SUPOLEN summer school 2015
    Capri, Italy (July 2015)
  • Coarse-grained simulations for flow of soft matter systems with solid interfaces
    Physics of Soft and Biological Matter 2016 - organized by Institute of Physics (IOP)
    Cambridge, U.K. (April 2016)
  • Coarse-grained simulations for flow of highly frictional soft matter systems
    International Soft Matter Conference
    Grenoble, France (September 2016)
  • Coarse-grain simulations for flow of highly frictional soft matter systems
    Computational Sciences for Future Energy Conference
    Utrecht, The Netherlands (October 2016)