Ponències/Comunicacions de congressos
http://hdl.handle.net/2117/129132
2024-03-29T08:47:41ZOptimization of synthetic jet actuation on a SD7003 airfoil in stall conditions
http://hdl.handle.net/2117/371266
Optimization of synthetic jet actuation on a SD7003 airfoil in stall conditions
Monshi Tousi, Navid; El Mansy, Reda; Mellibovsky Elstein, Fernando; Bergadà Granyó, Josep Maria
We optimise a set of Synthetic Jet (SJ) Active Flow Control (AFC) parameters on a SD7003 airfoil in order to maximise lift and aerodynamic efficiency. 2D-RANS with the Spallart Almaras (SA) turbulence model is employed in the optimisation process. The optimal set of SJ parameters is then tested using LES. Comparison between 2D RANS-SA and 3D LES results shows the necessity of tuning the SA model parameters to further improve the reliability of a 2D-simulation-based optimisation. Notwithstanding this, both RANS-SA and LES results show that airfoil efficiency can be drastically improved with SJ AFC
2022-07-27T09:28:33ZMonshi Tousi, NavidEl Mansy, RedaMellibovsky Elstein, FernandoBergadà Granyó, Josep MariaWe optimise a set of Synthetic Jet (SJ) Active Flow Control (AFC) parameters on a SD7003 airfoil in order to maximise lift and aerodynamic efficiency. 2D-RANS with the Spallart Almaras (SA) turbulence model is employed in the optimisation process. The optimal set of SJ parameters is then tested using LES. Comparison between 2D RANS-SA and 3D LES results shows the necessity of tuning the SA model parameters to further improve the reliability of a 2D-simulation-based optimisation. Notwithstanding this, both RANS-SA and LES results show that airfoil efficiency can be drastically improved with SJ AFCSquare cylinder downstream of two different-velocity streams
http://hdl.handle.net/2117/370925
Square cylinder downstream of two different-velocity streams
El Mansy, Reda; Monshi Tousi, Navid; Bergadà Granyó, Josep Maria; Mellibovsky Elstein, Fernando
We study the flow past a square cylinder immersed in the wake of an upstream splitter plate separating two different-velocity streams. The bottom stream Reynolds number, ReB = 56 is kept constant for all cases, while the top-to-bottom Reynolds numbers ratio R = ReT/ReB is in the range R ¿ [1,6.5], corresponding to a variation of the bulk Reynolds number Re = (ReT +ReB)/2 ¿ [56, 210]. The onset of vortex-shedding, at R = 2.1 ± 0.1 (corresponding to Re = 86.8 ± 2.8), is pushed to higher Re as compared to the square cylinder in the classic configuration. The threedimensionality is triggered by a mode-C-type instability at R ¿ 3.1 (Re ¿ 115) with wavelength ¿z ¿2.5±0.1, similar to the mode reported for square cylinders placed at an incidence. For a velocity ratio R = 3.4 the flow is period-doubled and exhibits three spanwise symmetries: a mirror reflection and two spatiotemporal symmetries. The road to spatio-temporal chaos is initiated thereafter with a modulational period-doubling tertiary bifurcation at R ¿ (3.4,3.8) that also doubles the spanwise periodicity. The resulting nonlinear solution repeats after four vortex shedding cycles and retains only a spatiotemporal invariance consisting in the evolution by half a period followed by mirror reflection about a streamwise-cross-stream plane. At slighlty higher values R = 4, the flow becomes spatio-temporally chaotic, but the main features of mode C are still observable
2022-07-25T07:50:12ZEl Mansy, RedaMonshi Tousi, NavidBergadà Granyó, Josep MariaMellibovsky Elstein, FernandoWe study the flow past a square cylinder immersed in the wake of an upstream splitter plate separating two different-velocity streams. The bottom stream Reynolds number, ReB = 56 is kept constant for all cases, while the top-to-bottom Reynolds numbers ratio R = ReT/ReB is in the range R ¿ [1,6.5], corresponding to a variation of the bulk Reynolds number Re = (ReT +ReB)/2 ¿ [56, 210]. The onset of vortex-shedding, at R = 2.1 ± 0.1 (corresponding to Re = 86.8 ± 2.8), is pushed to higher Re as compared to the square cylinder in the classic configuration. The threedimensionality is triggered by a mode-C-type instability at R ¿ 3.1 (Re ¿ 115) with wavelength ¿z ¿2.5±0.1, similar to the mode reported for square cylinders placed at an incidence. For a velocity ratio R = 3.4 the flow is period-doubled and exhibits three spanwise symmetries: a mirror reflection and two spatiotemporal symmetries. The road to spatio-temporal chaos is initiated thereafter with a modulational period-doubling tertiary bifurcation at R ¿ (3.4,3.8) that also doubles the spanwise periodicity. The resulting nonlinear solution repeats after four vortex shedding cycles and retains only a spatiotemporal invariance consisting in the evolution by half a period followed by mirror reflection about a streamwise-cross-stream plane. At slighlty higher values R = 4, the flow becomes spatio-temporally chaotic, but the main features of mode C are still observableAerodynamic study of the NASA’s X-43A hypersonic aircraft
http://hdl.handle.net/2117/370912
Aerodynamic study of the NASA’s X-43A hypersonic aircraft
Navó, Alex; Bergadà Granyó, Josep Maria
A two-dimensional aerodynamic study of the NASA’s X-43A hypersonic aircraft is developed using two different approaches. The first one is analytical and based on the resolution of the oblique shock wave and Prandtl–Meyer expansion wave theories supported by an in-house program and considering a simplified aircraft’s design. The second approach involves the use of a Computational Fluid Dynamics (CFD) package, OpenFOAM and the real shape of the aircraft. The aerodynamic characteristics defined as the lift and drag coefficients, the aerodynamic efficiency and the pitching moment coefficient are calculated for different angles of attack. Evaluations are made for an incident Mach number of 7 and an altitude of 30 km. The CFD approach has been extended to a full threedimensional model in order to be compared with the 2D model
2022-07-22T12:17:09ZNavó, AlexBergadà Granyó, Josep MariaA two-dimensional aerodynamic study of the NASA’s X-43A hypersonic aircraft is developed using two different approaches. The first one is analytical and based on the resolution of the oblique shock wave and Prandtl–Meyer expansion wave theories supported by an in-house program and considering a simplified aircraft’s design. The second approach involves the use of a Computational Fluid Dynamics (CFD) package, OpenFOAM and the real shape of the aircraft. The aerodynamic characteristics defined as the lift and drag coefficients, the aerodynamic efficiency and the pitching moment coefficient are calculated for different angles of attack. Evaluations are made for an incident Mach number of 7 and an altitude of 30 km. The CFD approach has been extended to a full threedimensional model in order to be compared with the 2D modelCapillary microfluidics for immunoassays by integrating 3D printing and pressure-sensitive adhesive
http://hdl.handle.net/2117/355706
Capillary microfluidics for immunoassays by integrating 3D printing and pressure-sensitive adhesive
Azizian, Pooya; Guerrero-SanVicente, Elena; Grinyte, Ruta; Casals Terré, Jasmina; Cabot, Joan Marc
Herein, we present a versatile immunoassay device made by 3D-printed (3DP) multilevel microfluidic chip sealed by an optically clear Pressure-Sensitive Adhesive (PSA). The bioreceptors were effectively immobilized on the PSA. Both colorimetric and fluorescence detection methods were successfully applied by using clear and black photo-curable resins, respectively. The design relied on a 3D retention valve to provide a sequential system for all crucial steps of an immunoassay. By synchronizing the microchannel resistances, 3D retention valve, and suction pressure, reagents were driven and controlled uniquely by the capillary force without any external equipment. The proposed device is cost-effective, self-powered, robust, and ideal for non-expert users
2021-11-05T11:52:46ZAzizian, PooyaGuerrero-SanVicente, ElenaGrinyte, RutaCasals Terré, JasminaCabot, Joan MarcHerein, we present a versatile immunoassay device made by 3D-printed (3DP) multilevel microfluidic chip sealed by an optically clear Pressure-Sensitive Adhesive (PSA). The bioreceptors were effectively immobilized on the PSA. Both colorimetric and fluorescence detection methods were successfully applied by using clear and black photo-curable resins, respectively. The design relied on a 3D retention valve to provide a sequential system for all crucial steps of an immunoassay. By synchronizing the microchannel resistances, 3D retention valve, and suction pressure, reagents were driven and controlled uniquely by the capillary force without any external equipment. The proposed device is cost-effective, self-powered, robust, and ideal for non-expert users3D skin microfluidic phantom for in vitro wearable testing
http://hdl.handle.net/2117/332321
3D skin microfluidic phantom for in vitro wearable testing
Rabost Garcia, Genís; Carreras Gallo, Óscar; Colmena, Valeria; Aguilar, Javier; Punter Villagrasa, Jaime; Muñoz Pascual, Francesc Xavier; Farré Lladós, Josep; Casals Terré, Jasmina
A standardized and cost-effective perspiration phantom for in vitro testing is needed to replace the variable and resource consuming human tests at research level. Here, an alternative to the existing devices, which mainly are made of laser-perforated thin membranes, is presented using polydimethylsiloxane (PDMS) and soft lithography. The proposed method overcomes the fabrication challenges of replicating the eccrine sweat gland structure. Sweat glands conduits are faithfully defined in-plane and the skin interface is created by bonding multiple PDMS layers. Parameters such as sweat duct diameter, sweat gland density and wettability properties were successfully replicated
2020-11-17T13:42:27ZRabost Garcia, GenísCarreras Gallo, ÓscarColmena, ValeriaAguilar, JavierPunter Villagrasa, JaimeMuñoz Pascual, Francesc XavierFarré Lladós, JosepCasals Terré, JasminaA standardized and cost-effective perspiration phantom for in vitro testing is needed to replace the variable and resource consuming human tests at research level. Here, an alternative to the existing devices, which mainly are made of laser-perforated thin membranes, is presented using polydimethylsiloxane (PDMS) and soft lithography. The proposed method overcomes the fabrication challenges of replicating the eccrine sweat gland structure. Sweat glands conduits are faithfully defined in-plane and the skin interface is created by bonding multiple PDMS layers. Parameters such as sweat duct diameter, sweat gland density and wettability properties were successfully replicated3D-printing and computational fluid dynamics "meet" paperbased microfluidics for enhanced flow control in difusive sensors
http://hdl.handle.net/2117/330613
3D-printing and computational fluid dynamics "meet" paperbased microfluidics for enhanced flow control in difusive sensors
López Martínez, Joan Antoni; Fernández, Pau; Mehrdel, Pouya; Casals Terré, Jasmina
This paper proposes combination of a 3D printed cartridge and paper-based microfluidic design that minimizes the amount of sample required to achieve the best control over the diffusion Y-microfluidic mixers. The use of 3D printing techniques in combination with paper-based microfluidics enhance the flow synchronization and reduces the amount of reagents required. The porous zone has been modeled using computational fluid dynamics ANSYS Fluent software to achieve the maximum diffusion zone with the minimum fluid and time
2020-10-22T08:31:00ZLópez Martínez, Joan AntoniFernández, PauMehrdel, PouyaCasals Terré, JasminaThis paper proposes combination of a 3D printed cartridge and paper-based microfluidic design that minimizes the amount of sample required to achieve the best control over the diffusion Y-microfluidic mixers. The use of 3D printing techniques in combination with paper-based microfluidics enhance the flow synchronization and reduces the amount of reagents required. The porous zone has been modeled using computational fluid dynamics ANSYS Fluent software to achieve the maximum diffusion zone with the minimum fluid and timeMultilevel passive microfluidics for electrochemical biosensors
http://hdl.handle.net/2117/330578
Multilevel passive microfluidics for electrochemical biosensors
Azizian, Pooya; Ortega Novillo, Adrián; Ricart Campos, Jordi; Casals Terré, Jasmina; Cabot, Joan Marc
Herein, we present a proof-of-concept 3D (multilevel) passive microfluidic device for point-of-care applications including electrochemical biosensors. Multiphase flow (air-water interface) within multilevel microchannels has been evaluated using 3D numerical simulations. The design was based on a pre-programmed sequence of fluids (biofluids and electrolytes) on the surface of a biosensor using trigger valves and microchannel resistances. Flow was driven uniquely by the surface tension and the capillary force triggered by the introduction of the sample without any external microfluidic equipment
2020-10-21T12:43:49ZAzizian, PooyaOrtega Novillo, AdriánRicart Campos, JordiCasals Terré, JasminaCabot, Joan MarcHerein, we present a proof-of-concept 3D (multilevel) passive microfluidic device for point-of-care applications including electrochemical biosensors. Multiphase flow (air-water interface) within multilevel microchannels has been evaluated using 3D numerical simulations. The design was based on a pre-programmed sequence of fluids (biofluids and electrolytes) on the surface of a biosensor using trigger valves and microchannel resistances. Flow was driven uniquely by the surface tension and the capillary force triggered by the introduction of the sample without any external microfluidic equipmentPotencial de la celulosa en la construcción de nuevos materiales
http://hdl.handle.net/2117/129131
Potencial de la celulosa en la construcción de nuevos materiales
Vidal Lluciá, Teresa; Torres López, Antonio Luis; Valls Vidal, Cristina; Cusola Aumedes, Oriol; López Martínez, Joan Antoni; Fernández Santos, Julia; Clemente Escuin, Antonio; Roncero Vivero, María Blanca; Casals Terré, Jasmina; Farré Lladós, Josep
Actualmente, más de una tercera parte de los tipos de papeles que hoy empleamos son para nuevos usos que hace diez años no existían. Además, la demanda creciente de productos basados en materias primas renovables y la preocupación social hacia el medio ambiente, estimula el desarrollo de productos diferentes con nuevas aplicaciones y alto valor añadido. En los últimos años ha incrementado el interés por la necesidad de buscar alternativas a los materiales derivados del petróleo, que sean más sostenibles y renovables. Los soportes celulósicos son una buena opción siendo un material natural, renovable, reciclable y biodegradable. Uno de los principales campos de investigación en el desarrollo de productos para los sectores del “packaging”, es la obtención de nuevos materiales celulósicos con propiedades avanzadas similares a las que proporcionan los derivados del petróleo. Por otra parte, una de las nuevas aplicaciones del papel que se contempla es en la microfluídica: el uso del papel como material base para construcción de dispositivos microfluídicos y su aplicación de los dispositivos a ensayos para diagnosis médica
2019-02-14T13:08:26ZVidal Lluciá, TeresaTorres López, Antonio LuisValls Vidal, CristinaCusola Aumedes, OriolLópez Martínez, Joan AntoniFernández Santos, JuliaClemente Escuin, AntonioRoncero Vivero, María BlancaCasals Terré, JasminaFarré Lladós, JosepActualmente, más de una tercera parte de los tipos de papeles que hoy empleamos son para nuevos usos que hace diez años no existían. Además, la demanda creciente de productos basados en materias primas renovables y la preocupación social hacia el medio ambiente, estimula el desarrollo de productos diferentes con nuevas aplicaciones y alto valor añadido. En los últimos años ha incrementado el interés por la necesidad de buscar alternativas a los materiales derivados del petróleo, que sean más sostenibles y renovables. Los soportes celulósicos son una buena opción siendo un material natural, renovable, reciclable y biodegradable. Uno de los principales campos de investigación en el desarrollo de productos para los sectores del “packaging”, es la obtención de nuevos materiales celulósicos con propiedades avanzadas similares a las que proporcionan los derivados del petróleo. Por otra parte, una de las nuevas aplicaciones del papel que se contempla es en la microfluídica: el uso del papel como material base para construcción de dispositivos microfluídicos y su aplicación de los dispositivos a ensayos para diagnosis médica