Ecfd:ecfd 4th edition - Revision history

Benard at 12:32, 4 June 2021

2021-06-04T12:32:00Z

Benard: /* Turbulent flows - P. Bénard, CORIA */

2021-04-02T12:26:35Z

‎Turbulent flows - P. Bénard, CORIA

Benard: /* Turbulent flows - P. Bénard, CORIA */

2021-04-02T12:21:21Z

‎Turbulent flows - P. Bénard, CORIA

Sahut: /* Numerics - G. Lartigue, CORIA */

2021-04-02T10:41:39Z

‎Numerics - G. Lartigue, CORIA

Sahut: /* Numerics - G. Lartigue, CORIA */

2021-04-02T10:41:10Z

‎Numerics - G. Lartigue, CORIA

Benard: /* Thematics / Mini-workshops */

2021-04-02T09:38:31Z

‎Thematics / Mini-workshops

Sahut: /* Numerics - G. Lartigue, CORIA */

2021-04-01T14:26:10Z

‎Numerics - G. Lartigue, CORIA

Sahut: /* Numerics - G. Lartigue, CORIA */

2021-04-01T14:24:25Z

‎Numerics - G. Lartigue, CORIA

Sahut: /* Numerics - G. Lartigue, CORIA */

2021-04-01T14:17:02Z

‎Numerics - G. Lartigue, CORIA

Sahut: /* Numerics - G. Lartigue, CORIA */

2021-04-01T14:14:04Z

‎Numerics - G. Lartigue, CORIA

← Older revision		Revision as of 12:32, 4 June 2021
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	Integrating this efforts in some of the kernels has yieled a 4.2 acceleration between a full cpu compute node with 40 cascade lake cores and a the accelerated counter part using 4 NVIDIA V100 GPUs. Further more the case has been strong scaling tested up to 1024 gpus with excellent performance.		Integrating this efforts in some of the kernels has yieled a 4.2 acceleration between a full cpu compute node with 40 cascade lake cores and a the accelerated counter part using 4 NVIDIA V100 GPUs. Further more the case has been strong scaling tested up to 1024 gpus with excellent performance.
		+
		+	== Communications related to ECFD4 ==
		+
		+	=== Conferences ===
		+
		+	* S. Gremmo, F. Houtin-Mongrolle, P. Bénard, B. Duboc, G. Lartigue, V. Moureau, Large-Eddy Simulation of Deformable Wind Turbines, Wind Energy Science Conference, 2021
		+	* U. Vigny, S. Zeoli, F. Houtin-Mongrolle, L. Bricteux, P. Benard, Dynamic mesh adaptation to capture wind turbine wakes during LES simulations, Wind Energy Science Conference, 2021
		+
		+	=== Publications ===

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 === Turbulent flows - P. Bénard, CORIA ===
-''Participants: P. Bénard, P. Bénez, S. Gremmo, F. Houtin-Mongrolle, S. Meynet, E. Muller (CORIA), A. Barge, G. Balarac (LEGI), A. Viré (TUDelft), P. Tene Hedje, U. Vigny, L. Bricteux (UMONS)''
+''Participants: P. Bénard, P. Bénez, S. Gremmo, F. Houtin-Mongrolle, S. Meynet, E. Muller, I. Tsetoglou (CORIA), A. Barge, G. Balarac (LEGI), A. Viré (TUDelft), P. Tene Hedje, U. Vigny, L. Bricteux (UMONS)''
 Turbulent flows are involved in many applications. Its understanding and control is a major task to improve system design and efficiency. The intrinsic multi scale characteristics of turbulent flows makes CFD an interesting predictive tool to tackle these challenges. This project gathered four sub-projects related to Turbulent Flows. These activities have direct application in wind turbines flows or heat exchangers.

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 * '''Sub-project 1: Atmospheric turbulent wind modeling via recycling method (E. Muller, S. Meynet, U. Vigny, F. Houtin-Mongrolle, P. Bénard)'''
-The main objective of this sub-project was to take advantage of the recently developed recycling boundary condition in the YALES2 library to apply it on atmospheric turbulent flows. Such method can become an alternative to usual synthetic turbulence injection for such application. Some questions were tackled as the obtained mean velocity profile, the velocity fluctuation level and computational cost. The results showed a promising strategy but further investigations must be performed on the mesh resolution influence and floor wall model coupling.
+The main objective of this sub-project was to take advantage of the recently developed recycling boundary condition in the YALES2 library to apply it on atmospheric turbulent flows. Such method can become an alternative to usual synthetic turbulence injection for such application. Some questions were tackled as the obtained mean velocity profile, the velocity fluctuation level and computational cost. The results on a 3D domain showed a promising strategy but further investigations must be performed on the mesh resolution influence and floor wall model coupling.
 * '''Sub-project 2: Model development and validation for vertical axis wind turbine (I. Tsetoglou, P. Tene Hedje, P. Bénez, F. Houtin-Mongrolle, P. Bénard)'''
+This sub-project focused on the comparison and validation of 4 vertical axis wind turbine models in the YALES2 code: Actuator Line Method (ALM), Conservative Immersed Boundaries (CIB), rotating resolved geometry via Arbitrary Lagrangian-Eulerian solver (ALE) and resolved geometry in rotating frame (ICS). Each strategy present different advantages, drawbacks, precision and computational cost. The comparison has been performed on a 2D 3-blades (NACA0015) vertical axis wind turbine from Lanzafame et al. (2014). The power coefficient as a function of the turbine rotation speed showed a similar behaviour. More validation will be soon performed.
 * '''Sub-project 3: Multiphysics modelling of wind turbines (S. Gremmo, F. Houtin-Mongrolle, E. Muller, A. Viré)'''
+The main goal of this sub-project was to improve the geometrical description of horizontal axis wind turbine via the Actuator Line Method (ALM) in YALES2. A first step consisted in introducing a static tower and nacelle modeling using the same ALM model as the rotor. The implementation was validated on the academic NREL5MW turbine and loads on the tower and nacelle were retrieved, as well as the impact on the turbine wake. The secondary objective targeting the fluid-structure interaction of the tower and nacelle was only initiated during the workshop and will be continued after.
 * '''Sub-project 4: Advanced tools for turbulent flows study (A. Barge, S. Meynet, F. Houtin-Mongrolle, G. Balarac, P. Bénard)'''
 === User experience - R. Mercier, SAFRAN TECH ===
 ''Participants: Julien Leparoux and Renaud Mercier, Safran Tech, Adrien Grenouilloux and Pierre Bénard, CORIA''

@@ Line 182: / Line 182: @@
 [4] Alexandre J. Chorin. '''Numerical solution of the Navier-Stokes equations'''. ''Math. Comp.'', 22:745–762, 1968. [https://doi.org/10.1090/S0025-5718-1968-0242392-2]
-[5] Gerard L. G. Sleijpen, Diederick R. Fokkema. '''BiCGStab(ℓ) for linear equations involving unsymmetric matrices with complex spectrum'''. ''Electron. Trans. Numer. Anal.'', 1:11–32, 1993.
+[5] Gerard L. G. Sleijpen, Diederick R. Fokkema. '''BiCGStab(ℓ) for linear equations involving unsymmetric matrices with complex spectrum'''. ''Electron. Trans. Numer. Anal.'', 1:11–32, 1993. [http://etna.mcs.kent.edu/volumes/1993-2000/vol1/abstract.php?vol=1&pages=11-32]
- [http://etna.mcs.kent.edu/volumes/1993-2000/vol1/abstract.php?vol=1&pages=11-32]
 === Turbulent flows - P. Bénard, CORIA ===

← Older revision		Revision as of 10:41, 2 April 2021
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	[5] Gerard L. G. Sleijpen, Diederick R. Fokkema. '''BiCGStab(ℓ) for linear equations involving unsymmetric matrices with complex spectrum'''. ''Electron. Trans. Numer. Anal.'', 1:11–32, 1993.		[5] Gerard L. G. Sleijpen, Diederick R. Fokkema. '''BiCGStab(ℓ) for linear equations involving unsymmetric matrices with complex spectrum'''. ''Electron. Trans. Numer. Anal.'', 1:11–32, 1993.
		+	[http://etna.mcs.kent.edu/volumes/1993-2000/vol1/abstract.php?vol=1&pages=11-32]

	=== Turbulent flows - P. Bénard, CORIA ===		=== Turbulent flows - P. Bénard, CORIA ===

@@ Line 185: / Line 185: @@
 === Turbulent flows - P. Bénard, CORIA ===
 * turbulence injection
 * wall modeling

← Older revision		Revision as of 14:24, 1 April 2021
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	[4] Alexandre J. Chorin. '''Numerical solution of the Navier-Stokes equations'''. ''Math. Comp.'', 22:745–762, 1968. [https://doi.org/10.1090/S0025-5718-1968-0242392-2]		[4] Alexandre J. Chorin. '''Numerical solution of the Navier-Stokes equations'''. ''Math. Comp.'', 22:745–762, 1968. [https://doi.org/10.1090/S0025-5718-1968-0242392-2]
		+
		+	[5] Gerard L. G. Sleijpen, Diederick R. Fokkema. '''BiCGStab(ℓ) for linear equations involving unsymmetric matrices with complex spectrum'''. ''Electron. Trans. Numer. Anal.'', 1993, 1:11–32.

	=== Turbulent flows - P. Bénard, CORIA ===		=== Turbulent flows - P. Bénard, CORIA ===

← Older revision		Revision as of 14:17, 1 April 2021
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	[3] Ruben Specogna, Francesco Trevisan. '''A discrete geometric approach to solving time independent Schrödinger equation'''. '''Journal of Computational Physics''' 2011, 1370-1381. [https://www.sciencedirect.com/science/article/pii/S0021999110006091]		[3] Ruben Specogna, Francesco Trevisan. '''A discrete geometric approach to solving time independent Schrödinger equation'''. '''Journal of Computational Physics''' 2011, 1370-1381. [https://www.sciencedirect.com/science/article/pii/S0021999110006091]
		+
		+	[4] Alexandre J. Chorin. '''Numerical solution of the Navier-Stokes equations'''. ''Math. Comp.'', 22:745–762, 1968. [https://doi.org/10.1090/S0025-5718-1968-0242392-2]

	=== Turbulent flows - P. Bénard, CORIA ===		=== Turbulent flows - P. Bénard, CORIA ===

@@ Line 165: / Line 165: @@
 * '''Sub-project 3 (G. Sahut, G. Balarac, G. Lartigue):''' The main objective of this sub-project was to implement a '''URANS method with a semi-implicit solver in YALES2'''.
-G. Sahut: merci de compléter ta partie stp
+In view of the development of a hybrid URANS/LES solver in YALES2, we have extended a Semi-Implicit method to a Full-Implicit method by adding a second time derivative in the incompressible Navier-Stokes equations. Within the classical projection method [4], an implicit scheme is used to compute the velocity predictor. The resulting linear system is inverted using the BiCGStab(2) linear solver [5].
 * '''Sub-project 4 (G. Lartigue, V. Moureau):''' The main objective of this sub-project was to '''improve the precision and robustness of the Laplacian Operator in YALES2'''.