Ecfd:ecfd 6th edition - Revision history

Balarac: /* Projects */

2024-02-07T09:42:44Z

‎Projects

Houtin: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2024-02-06T09:44:13Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Houtin: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2024-02-06T09:43:39Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T13:31:35Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T11:14:29Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T11:14:28Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T11:13:40Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T11:09:43Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T11:07:47Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

Bricteux: /* Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA */

2023-05-26T11:07:11Z

‎Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA

@@ Line 153: / Line 153: @@
 Atmospheric flow such as Atmospheric Boundary Layer (ABL) and thermal stratification have an impact on wind turbines aerodynamic and wakes. Mostly at a wind farm scale, the change of wind turbine wake size and recovery can modify the global power production. During the workshop, the Coriolis force implementation has been validated through neutral case (where no thermal stratification i.e. no temperature gradient). It also allowed to validate the pressure forcing term, needed to drive the flow in a periodic box. YALES2 results showed a good agreement with other numerical and experimental results. Afterwards, the stable case (i.e. temperature gradient downwards) has been studied. A surface temperature as boundary condition has been developed. Yet, results are not as expected and further investigation is needed.
-=== Two Phase Flow - C. Merlin, Ariane Group & M. Cailler, Safran Tech ===
+=== Two Phase Flow - C. Merlin, Ariane Group & M. Cailler, Safran ===
 * '''Sub-project 1: Convergent computation of interface curvature (G. Ghigliotti, M. Benard, G. Balarac, J. Carmona, R. Mercier, G. Lartigue)'''
@@ Line 170: / Line 170: @@
 In a two-way coupled Eulerian-Lagrangian framework, dedidated numerical treatment is necessary as soon as the ratio between the particle size and the cell size is greater than unity. In this configuration, in the best case the evaluation of the undisturbed velocity and drag force is inacurate, and in the worst situation the high local Eulerian source-term may lead to gas velocity divergence. During the workshop, a gaussian-based regularization of the Eulerian source term was implemented and tested on various test cases. Use of this regularization shows improvement on the particle trajectory description, but still some errors are obtained for low particle Reynolds numbers. To improve the accuracy of the strategy the model for undisturbed gas velocity prediction proposed by (Balachandar, 2019) was tested. Unfortunately some difficulties were encoutered regarding its numerical implementation. Next steps will include a thorough validation of the method on isolated and interacting particles test cases and identification of model parameter for the gaussian-filter size.
-=== Combustion - K. Bioche, CORIA & R. Mercier, Safran Tech ===
+=== Combustion - K. Bioche, CORIA & R. Mercier, Safran ===
@@ Line 201: / Line 201: @@
 To reduce the cost of species source terms computation, a clustering method was adopted. It consists in detecting nodes with similar properties and compute chemical source terms only once for these. Still, considering each species in this process creates a high dimensional cluster, while replacing species by a user-set progress variable may not well describe species. The strategy adopted here relies on the application of a PCA on species. It can be viewed as an automated “progress variable” creation. The use of such strategy was shown to reduce the simulation cost of source term computation by a factor 6 on a simple 2D flame ball case.
-=== User Experience - J. Leparoux, Safran Tech & A. Pushkarev, GE Renewable Energy===
+=== User Experience - J. Leparoux, Safran & A. Pushkarev, GE Renewable Energy===
 * '''Sub-project 1: External coupling with CWIPI (R. Letournel, V. Moureau, C. Merlin, M. Cailler, P. Bégou, S. Meynet)'''

← Older revision		Revision as of 09:44, 6 February 2024
Line 59:		Line 59:


−	*'''Sub-project 2: ALE and remeshing for surface mesh based on 1D deformations - F. Houtin-Mongrolle ~~(SGRE)~~, E. Muller ~~(SGRE)~~, B. Duboc ~~(SGRE~~)'''	+	*'''Sub-project 2: ALE and remeshing for surface mesh based on 1D deformations (F. Houtin-Mongrolle, E. Muller, B. Duboc)'''
	During operation and maintenance, wind turbines are subject to particular inflow that may trigger significant 3D aerodynamic effects (Vortex, Induced Vibrations, over-speed, flutter…) that deform the blades. Typical Actuator line methods (ALM) are not enough to capture these types of Fluid-structure interactions. This project aimed to go from an ALM way of modeling the blades to a body-fitted mesh with ALE/re-meshing, depending on the blade deformations. The work is divided into three work packages. Work package 1: impose displacements from a 1D discretized line (6 DOF) into the blade surface. Work package 2: trigger re-meshing if the displacement of the cells reaches a bad quality (high skewness, negative node volume). The last work package is to be able to retrieve the forces and moments from the 2D surface to the initial 1D discretized line.		During operation and maintenance, wind turbines are subject to particular inflow that may trigger significant 3D aerodynamic effects (Vortex, Induced Vibrations, over-speed, flutter…) that deform the blades. Typical Actuator line methods (ALM) are not enough to capture these types of Fluid-structure interactions. This project aimed to go from an ALM way of modeling the blades to a body-fitted mesh with ALE/re-meshing, depending on the blade deformations. The work is divided into three work packages. Work package 1: impose displacements from a 1D discretized line (6 DOF) into the blade surface. Work package 2: trigger re-meshing if the displacement of the cells reaches a bad quality (high skewness, negative node volume). The last work package is to be able to retrieve the forces and moments from the 2D surface to the initial 1D discretized line.

@@ Line 57: / Line 57: @@
 / Refinement sensor based on vorticity gradients (palenstrophy) seems to works fairly wel.l
 / two levels strategy provides encouraging results
 === Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===

@@ Line 57: / Line 57: @@
 / Refinement sensor based on vorticity gradients (palenstrophy) seems to works fairly wel.l
 / two levels strategy provides encouraging results
 === Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===

@@ Line 57: / Line 57: @@
 / Refinement sensor based on vorticity gradients (palenstrophy) seems to works fairly wel.l
 / two levels strategy provides encouraging results
 === Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===

← Older revision	Revision as of 11:14, 26 May 2023
(No difference)

@@ Line 49: / Line 49: @@
 === Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA ===
 *'''Sub-project 1: Mesh adaptation for vortical flows (MAVERICK) for coupled systems of differential-algebraic equations (L. Bricteux, G. Balarac, S. Zeoli, G. Lartigue)'''
 === Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===

@@ Line 48: / Line 48: @@
 === Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA ===
-Sub-project 1: Multi-level domain decomposition method (DDM) for coupled systems of differential-algebraic equations (A. Quirós Rodrígues, V. Le Chenadec)
+'''Sub-project 1: Multi-level domain decomposition method (DDM) for coupled systems of differential-algebraic equations (A. Quirós Rodrígues, V. Le Chenadec)'''
 === Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===

← Older revision		Revision as of 11:07, 26 May 2023
Line 48:		Line 48:

	=== Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA ===		=== Mesh adaptation - R. Letournel, Safran & V. Moureau, CORIA ===
		+	Sub-project 1: Multi-level domain decomposition method (DDM) for coupled systems of differential-algebraic equations (A. Quirós Rodrígues, V. Le Chenadec)

	=== Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===		=== Numerics - S. Mendez, IMAG & M. Bernard, LEGI ===