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Flow Visualization
Flow Visualization
Our team's current focus is on advancing techniques for visualizing flow phenomena. Our research is poised to make significant strides in understanding and manipulating fluid dynamics, with far-reaching implications in aerospace technology. We use Smoke Flow Visualization, BOS, Schlieren and PIV techniques for devising better problem-solving methods for fluid flows. Our approach encompasses numerical, and empirical techniques, addressing both fundamental problems and industrial applications.
Smoke Visualization
Smoke Visualization
BOS
BOS
Schlieren
Schlieren
PIV
PIV
Schlieren Flow visualization
Thrust Vectoring (NPR 7 for Mach 1.6, Secondary Inlet at 0.57 SPR)
Velocity Contour at NPR 6 for Mach 1.6, Secondary Inlet at 0.5 SPR
Detached bow shock wave in front of a hemispherical blunt body
Oblique shock in front of a wedge of half angle 15º
Background Oriented Schlieren (BOS)
High Speed Projectile Flow Field
Supersonic Flow Interaction
Water and Glycerine Droplet breakup at Mach 1.5
Water table Experiment and CFD on 2D Compressible Fluid Flow
Flow Control and Measurements
Investigation of features of near-terrain flight
Investigation of features of near-terrain flight
We study the features of near-terrain flight in close proximity of sub-vertical topography, using numerical techniques as well as by performing experiments with unmanned aerial systems in the high-altitude mountainous region of Nepal. We are developing experimental aerial platforms to collect flight dynamic, aeroelastic, and performance data during the near-terrain flights to investigate the flight characteristics. The study is motivated to support the enhancement of safety and effectiveness of near-terrain operation of aircraft with further implementation on the scientific experiments or surveillance in complex topographical environments.
Supervised Graduate Thesis
Supervised Graduate Thesis
Pressure on Terrain surface at different time steps
An Assessment of the Impact of Blast Wave on Subvertical Geographical Terrain
An assessment of the impact of blast wave from an ammonium nitrate explosion on the subvertical geographical terrain using numerical techniques. The study can assist in setting the recommended practices for selection of the location of storage facilities and the associated measures.
Research Grant: University Grant Commission (UGC), Nepal
Simulation results for nozzle designed for Mach 2
Investigation of Exhaust Flow from Convergent-Divergent Nozzle
Exhaust flow from the nozzle have significant characteristics for the prediction of nozzle performance and hence proper understanding and investigation technique of nozzle flow and exhaust plume is worthwhile. A specific planar nozzle geometry with exit Mach 2 is designed and relevant thermodynamic parameters are calculated at various sections.
Research Grant: University Grant Commission (UGC), Nepal
Dutch roll mode of proposed UAS
Conceptual Design and Stability Analysis of a Fixed wing UAS Research Platform for Aerial Experiments
A fixed wing UAS design is proposed that can be used as a baseline platform to fly the test equipment onboard and perform the aerial experiments. The conceptual design of the UAS is done analytically which involves take-off weight estimation, constraint analysis, configuration selection and propulsion system selection.
Surface temperature contour of steel
Chill Down Process in Helical Cryogenic Transfer Line Internally Coated with Low Thermal Conductive Layer
Computational study of chill down process is carried out in a helical transfer line internally coated with low thermal conductive material of polytetraflouroethylene which belong to a family of Teflon carrying liquid nitrogen as cryogen. The effect of transfer line materials and change in dimensionless pitch ratio (axial pitch) in chill down time has been investigated.
Vorticity Z and Velocity contour for fully developed flow
Aeroelastic Energy Harvesting: A Case for Galloping
This research focuses on the numerical investigation of flow induced vibration based energy harvesting by the use of piezoelectric material. Two way coupled fluid structure interaction simulation is carried out to get the displacement of a square base prism and the result is used to calculate the power produced.
Research Grant: University Grant Commission (UGC), Nepal
Contour and Sampling of "No Free Lunch" Theorem
Data-Driven Discovery of Governing Equations
A physics-informed neural network (PINN) based framework to discover the governing partial differential equation(PDE) of a given system from data. Given data, the method generalizes a neural network to compute a matrix of candidate terms for PDE. Minimizing the residuals from the candidate matrix allows to find the coefficients for the equation. The framework presented discovers PDE not restricted to first order time derivative equations.
Injected water droplets after striking the wire mesh
Investigation of Fiber-Array Fabrics for Extraction of Water from Fog
The study of the conditions for fog water collection by the use of passive fog collector meshes identifies mountain tops of Nepal as potential sites suitable for fog water collection. Feasibility of fog water collection project depends on the very specific socio-economic, climatic, and technological conditions. This research focuses only on investigations of the effects of shade coefficient in the collection efficiency of the collector mesh.
Research Grant: Center of Research for Environment, Energy and Water (CREEW))
Pressure plot at bifurcation area of Penstock
Flow and Stress Analysis of Aged Penstock of Sundarijal Hydropower Plant (SJHPP)
This study investigates the actual condition of the existing penstock of Sundarijal Hydropower Plant (SJHPP) based on flow and stress analysis with an analytical approach as well as using commercial software. SJHPP is the second oldest hydropower plant of Nepal, and it is being upgraded from 640kW to 970kW with the replacement of all hydro-mechanical and electromechanical parts excluding penstock after 85 years operation of the plant.
Technical Support: Nepal Electricity Authority (NEA)
Supervised Undergraduate Projects
Supervised Undergraduate Projects
Development Of Hybrid Cross-Correlation And Optical Flow Method For Background Oriented Schlieren
PUL-076-BAS : Nimesh Chaulagain, Samiksha Dhakal, Sushant Poudel, Sushil Pandey
Flow Analysis of Baseline Wing and Wing with Vortex Generators Using Particle Image Velocimetry (PIV)
PUL-076-BAS : Kishitish C. Devkota, Praphul Mishra, Sandip Adhikari, Shreeju Ban
Fabrication of Particle Image Velocimetry Setup and Experimentation at Low Reynolds Number
PUL-075-AER : Ganesh Dhungana, Sandip Gautam, Yukesh Karki
Phase-Field Model for Simulation of Crack Propagation
PUL-075-AER : Amit Gupta, Helina Khanal, Shrawan Tamrakar
Numerical Study of Hypersonic Fluid-Structure Interaction on a Cantilevered Plante With Shock Impingement
PUL-075-AER : Nishchal Poudel, Sambhav Sahani, Subarna Pudasaini
Finite Element Analysis of Medical Oxygen Cylinder
PUL-075-BME : Himal Kumar Rana Magar, Khim Bahadur Basnet, Lilanath Ghimire
Modal Reduction of Flow during Dynamic Stall and Interpretation of the Ongoing Aerodynamic Phenomena
PUL-074-BME : Anup Pandey, Anushka Subedi, Manish Timsina, Sandip Gautam
Analysis of performance of Acoustically driven Thermoacoustic Refrigerator
PUL-073-BME : Roshan Bhandari, Sambhav Kharel, Satish K.C., Suraj Goswami
Design and Test of Search and Rescue Unmanned Aerial Vehicle
PUL-072-BME : Aditya Amatya, Bikash Kunwar, Sanjeeb Poudel, Ujwal Dhakal
Study and Analysis of Fuel Injection at Busemann Inlet at Mach 7
THA-071-BME : Abhishek Pandey, Rajan Bhandari, Sabin Subedi, Sanjeev Adhikari
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