Blar i NTNU Open på forfatter "Cervantes, Michel"
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Computation of developing turbulent flow through a straight asymmetric diffuser with moderate adverse pressure gradient
Salehi, S; Raisee, M; Cervantes, Michel (Journal article; Peer reviewed, 2017)In this paper, numerical investigation of three-dimensional, developing turbulent flow, subjected to a moderate adverse pressure gradient, has been investigated using various turbulence models, namely: the lowRe k , the ... -
Effects of upstream flow conditions on runner pressure fluctuations
Amiri, K; Mulu, B; Raisee, M; Cervantes, Michel (Journal article; Peer reviewed, 2017)The rotor-stator interaction and the corresponding pressure fluctuations represent one of the sources of pressure and load fluctuations on the rotating parts of rotating machineries. The high-Reynolds flow is subject to ... -
Experimental and Numerical Studies of a High-Head Francis Turbine: A Review of the Francis-99 Test Case
Trivedi, Chirag; Cervantes, Michel; Dahlhaug, Ole Gunnar (Peer reviewed; Journal article, 2016)Hydraulic turbines are widely used to meet real-time electricity demands. Computational fluid dynamic (CFD) techniques have played an important role in the design and development of such turbines. The simulation of a ... -
Experimental Investigation of a High Head Model Francis Turbine During Steady-State Operation at Off-Design Conditions
Bergan, Carl Werdelin; Goyal, Rahul; Cervantes, Michel; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2016)Francis-99 is a set of workshops aiming to determine the state of the art of high head Francis turbine simulations (flow and structure) under steady and transient operating conditions as well as promote their development ... -
Experimental investigation on a high head model Francis turbine during load rejection
Goyal, Rahul; Bergan, Carl Werdelin; Cervantes, Michel; Gandhi, B. K.; Dahlhaug, Ole Gunnar (Journal article; Peer reviewed, 2016)Francis-99 is a set of workshop aiming to determine the state of the art of high head model Francis turbine simulations (flow and structure) under steady and transient operating conditions as well as to promote their ... -
Fluid-structure interactions in Francis turbines: A perspective review
Trivedi, Chirag; Cervantes, Michel (Journal article; Peer reviewed, 2017)Competitive electricity prices and reduced profit margins have forced hydraulic turbines to operate under critical conditions. The demand for extended operating ranges and the high efficiency of the turbine runners have ... -
Investigation and validation of a Francis turbine at runaway operating conditions
Trivedi, Chirag; Cervantes, Michel; Gandhi, BK (Journal article; Peer reviewed, 2016)Hydraulic turbines exhibit total load rejection during operation because of high fluctuations in the grid parameters. The generator reaches no-load instantly. Consequently, the turbine runner accelerates to high speed, ... -
Investigation of the Numerical Methodology of a Model Wind Turbine Simulation
Tabatabaei, Narges; Cervantes, Michel; Trivedi, Chirag (Journal article; Peer reviewed, 2018)The present work aims to investigate different methodologies for the numerical simulation of an upwind three-bladed wind turbine; which is supposed to be a base model to simulate icing in cold climate windmills. That is a ... -
Maximum pressure evaluation during expulsion of entrapped air from pressurized pipelines
Bucur, Diana Maria; Dunca, Georgiana; Cervantes, Michel (Journal article; Peer reviewed, 2017)Pressurized pipeline systems may have a wide operating regime. This paper presents the experimental analysis of the transient flow in a horizontal pipe containing an air pocket, which allows the ventilation of the air after ... -
Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner
Soltani Dehkharqani, Arash; Cervantes, Michel; Aidanpää, Jan-Olov (Journal article; Peer reviewed, 2017)The impact of fluid on the runner of a hydraulic turbine is a recurrent problem. Fully coupled fluid–structure simulations are extremely time-consuming. Thus, an alternative method is required to estimate this interaction ... -
Numerical Simulation and Validation of a High Head Model Francis Turbine at Part Load Operating Condition
Goyal, Rahul; Trivedi, Chirag; Gandhi, BK; Cervantes, Michel (Journal article, 2017)Hydraulic turbines are operated over an extended operating range to meet the real time electricity demand. Turbines operated at part load have flow parameters not matching the designed ones. This results in unstable flow ... -
On the use of the water hammer equations with time dependent friction during a valve closure, for discharge estimation
Dunca, G; Iovanel, RG; Bucur, DM; Cervantes, Michel (Peer reviewed; Journal article, 2016)The paper presents a new method for in site discharge estimation in pressured pipes. The method consists in using the water hammer equations solved with the method of characteristics with an unsteady friction factor model. ... -
Time-Dependent Effects of Glaze Ice on the Aerodynamic Characteristics of an Airfoil
Tabatabaei, Narges; Cervantes, Michel; Trivedi, Chirag (Journal article; Peer reviewed, 2018)The main objective of this study is to estimate the dynamic loads acting over a glaze-iced airfoil. This work studies the performance of unsteady Reynolds-averaged Navier-Stokes (URANS) simulations in predicting the ...