DF - Dinàmica No Lineal de Fluids
http://hdl.handle.net/2117/1085
2017-09-20T09:30:06ZNACA 2412 performance modification via using AFC
http://hdl.handle.net/2117/107734
NACA 2412 performance modification via using AFC
Summ, Thorsten; Prakash, Bhanu; Bergadà Granyó, Josep Maria; Wierschem, Andreas; Mellibovsky Elstein, Fernando
The NACA 2412 profile was numerically studied via employing 2D-DNS and implementing Active Flow Control (AFC), the Reynolds number considered was 6757, being the angle of attack of 8º. Initially, the basic flow without implementing AFC was considered, the point in which the boundary layer separates as well as the y+ value along the profile length were evaluated. A single groove location, just before the separation point, was considered, periodic forcing was employed to both modify the location of the separation point and change the separation area where vortices are present. This was undertaken resulting in a reduction of the drag coefficient while increasing the lift. Via studying a set of frequencies and amplitudes linked with the AFC periodic actuation, it was obtained the optimum set of parameters to minimize the drag while maximizing the lift.
2017-09-18T12:48:14ZSumm, ThorstenPrakash, BhanuBergadà Granyó, Josep MariaWierschem, AndreasMellibovsky Elstein, FernandoThe NACA 2412 profile was numerically studied via employing 2D-DNS and implementing Active Flow Control (AFC), the Reynolds number considered was 6757, being the angle of attack of 8º. Initially, the basic flow without implementing AFC was considered, the point in which the boundary layer separates as well as the y+ value along the profile length were evaluated. A single groove location, just before the separation point, was considered, periodic forcing was employed to both modify the location of the separation point and change the separation area where vortices are present. This was undertaken resulting in a reduction of the drag coefficient while increasing the lift. Via studying a set of frequencies and amplitudes linked with the AFC periodic actuation, it was obtained the optimum set of parameters to minimize the drag while maximizing the lift.Nonsingular black holes, the cosmological constant and asymptotic safety
http://hdl.handle.net/2117/105850
Nonsingular black holes, the cosmological constant and asymptotic safety
Torres Herrera, Ramon
Quantum gravitational effects in black hole spacetimes with a cosmological constant ¿ are considered. The effective quantum spacetimes for the black holes are constructed by taking into account the renormalization group improvement of classical solutions obtained in the framework of unimodular gravity (a theory which is identical to general relativity at a classical level). This allows us to avoid the usual divergences associated with the presence of a running ¿. The horizons and causal structure of the improved black holes are discussed, taking into account the current observational bounds for the cosmological constant. It is shown that the resulting effective quantum black hole spacetimes are always devoid of singularities.
2017-06-26T08:31:46ZTorres Herrera, RamonQuantum gravitational effects in black hole spacetimes with a cosmological constant ¿ are considered. The effective quantum spacetimes for the black holes are constructed by taking into account the renormalization group improvement of classical solutions obtained in the framework of unimodular gravity (a theory which is identical to general relativity at a classical level). This allows us to avoid the usual divergences associated with the presence of a running ¿. The horizons and causal structure of the improved black holes are discussed, taking into account the current observational bounds for the cosmological constant. It is shown that the resulting effective quantum black hole spacetimes are always devoid of singularities.Non-singular quantum improved rotating black holes and their maximal extension
http://hdl.handle.net/2117/105845
Non-singular quantum improved rotating black holes and their maximal extension
Torres Herrera, Ramon
We add a prescription to the Newman–Janis algorithm in order to use it as a means of finding new extended rotating black hole spacetimes from static spherically symmetric ones. Then, we apply the procedure to a quantum improved black hole spacetime coming from Quantum Einstein Gravity in order to get the maximally extended spacetime corresponding to a non-singular rotating black hole. We rigourously check for the existence of scalar curvature singularities in the quantum improved rotating spacetime and we show that it is devoid of them. We also analyze the horizons and causal structure of the rotating black hole and provide Penrose diagrams for the maximally extended spacetime.
The final publication is available at Springer via 10.1007/s10714-017-2236-5
2017-06-26T08:04:46ZTorres Herrera, RamonWe add a prescription to the Newman–Janis algorithm in order to use it as a means of finding new extended rotating black hole spacetimes from static spherically symmetric ones. Then, we apply the procedure to a quantum improved black hole spacetime coming from Quantum Einstein Gravity in order to get the maximally extended spacetime corresponding to a non-singular rotating black hole. We rigourously check for the existence of scalar curvature singularities in the quantum improved rotating spacetime and we show that it is devoid of them. We also analyze the horizons and causal structure of the rotating black hole and provide Penrose diagrams for the maximally extended spacetime.Formation mechanisms for self-organized kilometer-scale shoreline sand waves
http://hdl.handle.net/2117/105391
Formation mechanisms for self-organized kilometer-scale shoreline sand waves
Falqués Serra, Albert; Ribas Prats, Francesca; Idier, Déborah; Arriaga García, Jaime Alonso
The feedbacks between morphology and waves through sediment transport are investigated as a source of kilometer-scale shoreline sand waves. In particular, the observed sand waves along Srd. Holmslands Tange, Denmark, are examined. We use a linear stability model based on the one-line approximation, linking the bathymetry to the perturbed shoreline. Previous models that consider the link by shifting the equilibrium profile and neglecting the curvature of the depth contours predict a positive feedback only if the offshore wave incidence angle (¿c) is above a threshold, ¿c¿42°. Considering curvilinear depth contours and using a linearly decaying perturbation in bed level, we find that ¿c can vary over the range 0–90° depending on the background bathymetric profile and the depth of closure, Dc. Associated to the perturbed wave refraction, there are two sources of instability: the alongshore gradients in wave angle, wave angle mechanism, and the alongshore gradients in wave energy induced by wave crest stretching, wave energy mechanism. The latter are usually destabilizing, but the former are destabilizing only for large enough Dc, steep foreshores, and gently sloping shorefaces. The critical angle comes out from the competition between both mechanisms, but when both are destabilizing, ¿c=0. In contrast with earlier studies, the model predicts instability for the Holmslands Tange coast so that the observed sand waves could have emerged from such instability. The key point is considering a larger Dc that is reasonably supported by both observations and wave climate, which brings the wave angle mechanism near the destabilizing threshold.
2017-06-13T16:56:47ZFalqués Serra, AlbertRibas Prats, FrancescaIdier, DéborahArriaga García, Jaime AlonsoThe feedbacks between morphology and waves through sediment transport are investigated as a source of kilometer-scale shoreline sand waves. In particular, the observed sand waves along Srd. Holmslands Tange, Denmark, are examined. We use a linear stability model based on the one-line approximation, linking the bathymetry to the perturbed shoreline. Previous models that consider the link by shifting the equilibrium profile and neglecting the curvature of the depth contours predict a positive feedback only if the offshore wave incidence angle (¿c) is above a threshold, ¿c¿42°. Considering curvilinear depth contours and using a linearly decaying perturbation in bed level, we find that ¿c can vary over the range 0–90° depending on the background bathymetric profile and the depth of closure, Dc. Associated to the perturbed wave refraction, there are two sources of instability: the alongshore gradients in wave angle, wave angle mechanism, and the alongshore gradients in wave energy induced by wave crest stretching, wave energy mechanism. The latter are usually destabilizing, but the former are destabilizing only for large enough Dc, steep foreshores, and gently sloping shorefaces. The critical angle comes out from the competition between both mechanisms, but when both are destabilizing, ¿c=0. In contrast with earlier studies, the model predicts instability for the Holmslands Tange coast so that the observed sand waves could have emerged from such instability. The key point is considering a larger Dc that is reasonably supported by both observations and wave climate, which brings the wave angle mechanism near the destabilizing threshold.Cold outbreaks at the mesoscale in the Western Mediterranean basin: from Raincells to rainbands
http://hdl.handle.net/2117/104892
Cold outbreaks at the mesoscale in the Western Mediterranean basin: from Raincells to rainbands
Mazón Bueso, Jordi; Pino González, David
This paper investigates cold outbreaks that form offshore density currents within the whole mesoscale over the Western
Mediterranean basin. Reflectivity radar and satellite images are used to detect clouds and precipitation that are associated with these
density currents in the meso-
훼
,meso-
훽
, and meso-
훾
over the Western Mediterranean basin (WMB). Version 3.3 of the WRF-ARW
model is used to describe the formation and evolution of these density currents and to estimate their lifetime as well as horizontal
and vertical scales. Based on the observations and simulations, this paper suggests that a new perspective could effectively be
adopted regarding the WMB region delineated by the Balearic Islands, the northeastern Iberian Peninsula, and the Gulf of Lion,
where inland cold outbreaks develop into density currents that move offshore and can produce precipitation ranging from raincells
to rainbands at the whole mesoscale.
2017-05-26T08:49:52ZMazón Bueso, JordiPino González, DavidThis paper investigates cold outbreaks that form offshore density currents within the whole mesoscale over the Western
Mediterranean basin. Reflectivity radar and satellite images are used to detect clouds and precipitation that are associated with these
density currents in the meso-
훼
,meso-
훽
, and meso-
훾
over the Western Mediterranean basin (WMB). Version 3.3 of the WRF-ARW
model is used to describe the formation and evolution of these density currents and to estimate their lifetime as well as horizontal
and vertical scales. Based on the observations and simulations, this paper suggests that a new perspective could effectively be
adopted regarding the WMB region delineated by the Balearic Islands, the northeastern Iberian Peninsula, and the Gulf of Lion,
where inland cold outbreaks develop into density currents that move offshore and can produce precipitation ranging from raincells
to rainbands at the whole mesoscale.The influence of an increase of the Mediterranean Sea Surface Temperature on two nocturnal offshore rainbands: a numerical experiment
http://hdl.handle.net/2117/104218
The influence of an increase of the Mediterranean Sea Surface Temperature on two nocturnal offshore rainbands: a numerical experiment
Mazón Bueso, Jordi; Pino González, David
Using the Weather Research and Forecasting (WRF) – Advanced Research WRF (ARW)
mesoscale model (WRF–ARW), we investigate how two nocturnal offshore rainbands occurring in
the Mediterranean basin are modified in a warmer sea surface temperature (SST). After sunset, the
thermal difference between land and sea air increases. Driven by drainage winds or land breeze, the
inland cold air interacts with the relatively warmer and moister air over the sea. Vertical movement
of sea air over the boundary between the two air masses may induce cloud and rain bands offshore.
When an increase of SST is prescribed in the WRF simulations, a change in the precipitation pattern is
simulated. The numerical experiments show an increase both in the extension and location of the
rainbands and in the precipitation rate. These changes, induced by the modified SST, are analyzed by
estimating and comparing several parameters such as the location of level of free convection (LFC),
Convective Available Potential Energy (CAPE), or the triggering, deceleration and blockage terms of
simplified conceptual models.
2017-05-09T08:02:07ZMazón Bueso, JordiPino González, DavidUsing the Weather Research and Forecasting (WRF) – Advanced Research WRF (ARW)
mesoscale model (WRF–ARW), we investigate how two nocturnal offshore rainbands occurring in
the Mediterranean basin are modified in a warmer sea surface temperature (SST). After sunset, the
thermal difference between land and sea air increases. Driven by drainage winds or land breeze, the
inland cold air interacts with the relatively warmer and moister air over the sea. Vertical movement
of sea air over the boundary between the two air masses may induce cloud and rain bands offshore.
When an increase of SST is prescribed in the WRF simulations, a change in the precipitation pattern is
simulated. The numerical experiments show an increase both in the extension and location of the
rainbands and in the precipitation rate. These changes, induced by the modified SST, are analyzed by
estimating and comparing several parameters such as the location of level of free convection (LFC),
Convective Available Potential Energy (CAPE), or the triggering, deceleration and blockage terms of
simplified conceptual models.Emergence of spatio-temporal dynamics from exact coherent solutions in pipe flow
http://hdl.handle.net/2117/104197
Emergence of spatio-temporal dynamics from exact coherent solutions in pipe flow
Ritter, Paul; Mellibovsky Elstein, Fernando; Avila Cañellas, Marc
Turbulent-laminar patterns are ubiquitous near transition in wall-bounded shear flows. Despite recent progress in describing their dynamics in analogy to non-equilibrium phase transitions, there is no theory explaining their emergence. Dynamical-system approaches suggest that invariant solutions to the Navier–Stokes equations, such as traveling waves and relative periodic orbits in pipe flow, act as building blocks of the disordered dynamics. While recent studies have shown how transient chaos arises from such solutions, the ensuing dynamics lacks the strong fluctuations in size, shape and speed of the turbulent spots observed in experiments. We here show that chaotic spots with distinct dynamical and kinematic properties merge in phase space and give rise to the enhanced spatio-temporal patterns observed in pipe flow. This paves the way for a dynamical-system foundation to the phenomenology of turbulent-laminar patterns in wall-bounded extended shear flows.
2017-05-08T12:21:38ZRitter, PaulMellibovsky Elstein, FernandoAvila Cañellas, MarcTurbulent-laminar patterns are ubiquitous near transition in wall-bounded shear flows. Despite recent progress in describing their dynamics in analogy to non-equilibrium phase transitions, there is no theory explaining their emergence. Dynamical-system approaches suggest that invariant solutions to the Navier–Stokes equations, such as traveling waves and relative periodic orbits in pipe flow, act as building blocks of the disordered dynamics. While recent studies have shown how transient chaos arises from such solutions, the ensuing dynamics lacks the strong fluctuations in size, shape and speed of the turbulent spots observed in experiments. We here show that chaotic spots with distinct dynamical and kinematic properties merge in phase space and give rise to the enhanced spatio-temporal patterns observed in pipe flow. This paves the way for a dynamical-system foundation to the phenomenology of turbulent-laminar patterns in wall-bounded extended shear flows.The potential risk induced by climate change in the context of mega-nourishments
http://hdl.handle.net/2117/104189
The potential risk induced by climate change in the context of mega-nourishments
Arriaga García, Jaime Alonso; Rutten, Jantien; Ribas Prats, Francesca; Ruessink, Gerben; Falqués Serra, Albert
2017-05-08T11:31:48ZArriaga García, Jaime AlonsoRutten, JantienRibas Prats, FrancescaRuessink, GerbenFalqués Serra, AlbertOn regular rotating black holes
http://hdl.handle.net/2117/103448
On regular rotating black holes
Torres Herrera, Ramon; Fayos Vallés, Francisco
Different proposals for regular rotating black hole spacetimes have appeared recently in the literature. However, a rigorous analysis and proof of the regularity of this kind of spacetimes is still lacking. In this note we analyze rotating Kerr-like black hole spacetimes and find the necessary and sufficient conditions for the regularity of all their second order scalar invariants polynomial in the Riemann tensor. We also show that the regularity is linked to a violation of the weak energy conditions around the core of the rotating black hole.
The final publication is available at Springer via 10.1007/s10714-016-2166-7
2017-04-07T11:29:58ZTorres Herrera, RamonFayos Vallés, FranciscoDifferent proposals for regular rotating black hole spacetimes have appeared recently in the literature. However, a rigorous analysis and proof of the regularity of this kind of spacetimes is still lacking. In this note we analyze rotating Kerr-like black hole spacetimes and find the necessary and sufficient conditions for the regularity of all their second order scalar invariants polynomial in the Riemann tensor. We also show that the regularity is linked to a violation of the weak energy conditions around the core of the rotating black hole.On the physics behind coastal morphodynamic patterns
http://hdl.handle.net/2117/103092
On the physics behind coastal morphodynamic patterns
Ribas Prats, Francesca; Falqués Serra, Albert; de Swart, Huib E.; Dodd, Nicholas; Garnier, Roland Charles; Calvete Manrique, Daniel
2017-03-30T09:53:19ZRibas Prats, FrancescaFalqués Serra, Albertde Swart, Huib E.Dodd, NicholasGarnier, Roland CharlesCalvete Manrique, Daniel