Browsing by Author "Fernandes, Ignatius"
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Item Lattice Boltzmann Simulation of Forced Convection in Non-Newtonian Fluid Through Low Permeable Porous Media(Far East Journal of Mathematical Sciences Volume 100, Number 2, 2016, Pages 315-332, 2016-07) Fernandes, IgnatiusNumerical simulation is carried out to study forced convection in non-Newtonian fluids flowing through low permeable porous media like sandstones and sand. Simulation is carried out using lattice Boltzmann method for both shear-thinning and shear-thickening, by varying the power-law index from 0.5 to 1.5 in Carreau-Yasuda model. Parameters involved in lattice Boltzmann method and Carreau model are identified to achieve numerical convergence. Permeability and porosity are varied in the range of 10 10Item Numerical Simulation of Blood Flow with Sodium Alginate (SA) Nano Particles in Stenosed Human Arteries in the presence of Body Acceleration(International Journal of Mechanical Engineering and Technology Volume 10, Issue 06, June 2019, 2019) Fernandes, IgnatiusNumerical simulation of blood flow with sodium alginate nano particles in stenosed human arteries in the presence of body acceleration is obtained. Effect of sodium alginate (SA) nano particles in the presence of body acceleration is observed on velocity, flow rate and resistive impedance to blood flow in stenosed human artery. The governing equations are discretized by explicit finite difference scheme. The discretized equations are the simulated using MATLAB. Velocity, flow rate and impedance to flow are observed to be influenced in the presence of both nano particles as well as body acceleration. The joint effect of nano particles and body acceleration is also observed. Resistance to flow is observed to be less in the presence of nano particles. This nano particle drug delivery may be useful for patients having cardiovascular diseases.Item NUMERICAL SIMULATION OF FORCED CONVECTION IN OIL SANDS USING LATTICE BOLTZMANN METHOD(International Journal of Mechanical Engineering and Technology (IJMET) Volume 7, Issue 1, Jan-Feb 2016, pp. 78-89, 2016) Fernandes, IgnatiusLattice Boltzmann method is used to simulate forced convection in oil sands (low permeable porous geometries). Fluid flows through a sandstone look alike square geometry with left wall of the geometry kept at higher temperature compared to other walls. Investigation is carried out to study influence of increased temperature on flow properties by observing the variation in velocity and temperature profiles for various permeability and porosity values, which were varied to match the geometrical properties of oil sands. Boundary conditions and the relaxation parameter are suitably defined to achieve convergence for low values of permeability. Simulation was carried out at low Reynolds number, which however, can be extended to higher values of Reynolds number.Item Shear-thinning fluid flow in porous media: A study of boundary behavior using lattice Boltzmann method(International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 3, March 2017, pp. 13–21, 2017-03) Fernandes, IgnatiusSimulation of fluid flow in porous media using lattice Boltzmann method depends on how effectively collision, streaming and boundary conditions are implemented at micro level in view of the macroscopic behaviour of fluid. While collision and streaming have been extensively researched and attained effective formulation, boundary conditions still remains to be studied thoroughly. This paper studies various boundary conditions that are defined to simulate non-Newtonian fluid flow in porous media using lattice Boltzmann method. Further, these conditions are applied to simulate the problem of non-Newtonian forced convection in porous media and the variation in flow regimes and rate of heat transfer is studied based on the variation in velocity and thermal boundary behavior. Though velocity boundary conditions did not produce any difference in the flow regimes, thermal boundary conditions produced significant variation in rate of heat transferItem Simulation of forced convection in non-Newtonian fluid through sandstones(International Journal for Computational Methods in Engineering Science and Mechanics Volume 18, 2017 - Issue 6, 2017-09) Fernandes, IgnatiusNumerical simulation is carried out to study forced convection in non-Newtonian fluids flowing through sandstones. Simulation is carried out using lattice Boltzmann method (LBM) for both shear-thinning and shear-thickening, by varying the power law index from 0.5 to 1.5 in Carreau–Yasuda model. Parameters involved in LBM and Carreau model are identified to achieve numerical convergence. Permeability and porosity are varied in the range of 10−10–10−6 and 0.1–0.7, respectively, to match actual geometrical properties of sandstone. Numerical technology is validated by establishing Darcy's law by plotting the graph between velocity and pressure gradient. Consequently, investigation is carried out to study the influence of material properties of porous media on flow properties such as velocity profiles, temperature profiles, and Nusselt number.Item Simulation of Natural Convection in Blood Flow using Lattice Boltzmann Method(Advances and Applications in Fluid Mechanics Volume 23, Number 1, 2019, Pages 25-44, 2019) Fernandes, IgnatiusLattice Boltzmann method is used to simulate natural convection in blood flow through stenotic artery. The problem of natural convection in stenotic artery is considered and the influence of elevated temperature and material properties is studied on the flow properties. A porous like square stenotic medium in a human artery with fluid (blood) at the left wall of the geometry and the north wall kept to a normalized temperature of 1.0 is considered. The flow properties like velocity profiles, streamlines, temperature profiles and the rate of heat transfer are then studied with respect to the material properties like porosity and permeability and flow parameters like Rayleigh number and power law index.