Explosive that cover all S-ALE space
Eray KILIÇ
James M. Kennedy
Dear Anton,
The LS-DYNA ALE/FSI package is widely used in studying structures under
blast loading. Generally, the ALE mesh is necessarily unstructured to
accommodate complex geometries; however, for simple rectilinear geo-
metries, a structured, logically regular, mesh can be utilized. Recogni-
tion of the latter case leads to algorithmic simplifications, memory
reductions, and performance enhancements, which are impossible in un-
structured mesh geometries. The new S-ALE solver is easy to use,
especially for users acquainted with the ALE solver. Only two new
keywords are introduced: *ALE_ STRUCTURED_MESH and *ALE_STRUCTURED_MESH
_CONTROL_POINTS. The former is used to generate the mesh and invokes
S-ALE solver, and the latter is to provide mesh spacing information
along each local directions. Other ALE keywords remain the same:
Chen, H, and Do, I., "Recent Developments in LS-DYNA S-ALE", 15th
International LS-DYNA Users Conference, Dearborn, Michigan, June, 2018.
The study presented in this paper compared the newer Structured ALE
(S-ALE) method of blast system simulation to that of the traditional
ALE method. The S-ALE method has the computational advantage compared
to the ALE and is promising in blast simulation where computational time
is the significant cost and a robust and reliable reduced order modeling
need be established:
Babu, V., Kulkarni, K., Kankanalapalli, S., Khatib-Shahidi, V., and
Vunnam, M., "Comparative Analysis of Occupant Responses between LS-DYNA
Arbitrary Lagrange in Euler (ALE) and Structured-ALE (S-ALE) METHODS",
15th International LS-DYNA Users Conference, Dearborn, Michigan, June,
2018.
Short tutorials for S-ALE
Chen, H., "LS-DYNA Structured ALE (S-ALE) Solver: Mesh Generation and
Input Setup", Livermore Software Technology Corporation, Livermore,
California, (undated publication).
https://ftp.lstc.com/anonymous/outgoing/hao/sale/tutorials/S-ALE_Solver_1.pdf
Chen, H., “On Setting up a 2D Structured ALE Model”, Livermore Software
Technology Corporation, Livermore, California, (undated publication).
https://ftp.lstc.com/anonymous/outgoing/hao/sale/tutorials/Structured%20ALE%20Tutorial%204.pdf
examples of S-ALE models
http://ftp.lstc.com/anonymous/outgoing/hao/sale/models/
Sincerely,
James M. Kennedy
KBS2 Inc.
March 29, 2021
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James M. Kennedy
Dear Ersay,
---------------------------------
An earlier note:
Three numerical models were established in LS‐DYNA, using either Mat_Elastic_Fluid, Mat_Null
with an Equation of State, and Mat_ALE_Incompressible_Fluid for describing the CSF. For a fair
comparison, an Arbitrary Lagrangian Eulerian (ALE) discretization was used for all models:
Klug, C., Sinz, W., Brenn, G., and Feist, F., “Experimental Sphere‐in‐Sphere Testing for the Valid-
ation of a Numerical Cerebrospinal Fluid Model”, Paper IRC-13-53, 2013 International Research
Council on the Biomechanics of Injury (IRCOBI) Conference, Gothenburg, Sweden, September,
2013.
http://www.ircobi.org/wordpress/downloads/irc13/pdf_files/53.pdf
The computation of fluid forces acting on a rigid or deformable structure constitutes a major problem
in fluid- structure interaction. However, the majority of numerical tests consists in using two different
codes to separately solve pressure of the fluid and structural displacements. In this paper, a monolithic
with an ALE formulation approach was used to implicitly calculate the pressure of an incompressible
fluid applied to the structure. The projection method proposed by Gresho was used to decouple the
velocity and pressure:
Aquelet, N., and Souli, M., "ALE Incompressible Fluid in LS-DYNA", 9th European LS-DYNA
Users Conference, Manchester, United Kingdom, May, 2013.
http://www.dynalook.com/9th-european-ls-dyna-conference/ale-incompressible-fluid-in-ls-dyna
The computation of fluid forces acting on a rigid or deformable structure constitutes a major problem
in fluid- structure interaction. However, the majority of numerical tests consists in using two different
codes to separately solve pressure of the fluid and structural displacements. In this paper, a monolithic
with an ALE formulation approach was used to implicitly calculate the pressure of an incompressible
fluid applied to the structure. The projection method proposed by Gresho was used to decouple the
velocity and pressure:
Aquelet, N., and Souli, M., "ALE Incompressible Fluid in LS-DYNA", 12th International LS-DYNA
Users Conference, Dearborn, Michigan, June, 2012.
http://www.dynalook.com/international-conf-2012/fsi-ale23-e.pdf
The computation of fluid forces acting on a rigid or deformable structure constitutes a major problem
in fluid- structure interaction. However, the majority of numerical tests consists in using two different
codes to separately solve pressure of the fluid and structural displacements. In this paper, a monolithic
with an ALE formulation approach was used to implicitly calculate the pressure of an incompressible
fluid applied to the structure. The projection method proposed by Gresho was used to decouple the
velocity and pressure:
Souli, M., "ALE Incompressible Fluid in LS-DYNA", 11th International LS-DYNA Users Conference,
Dearborn, Michigan, June, 2010.
http://www.dynalook.com/international-conf-2010/FluidFSI-5.pdf
---------------------------------
ALE and FSI
In this seminar, you receive comprehensive information directly from one of the program developers
about the latest developments of the features provided by the solver LS-DYNA to analyse fluids and,
in particular, the fluid-structure interaction using its Arbitrary Lagrangian Eulerian (ALE) capabilities.
https://www.dynamore.de/en/training/seminars/multiphysics-biomechanics/ale-and-fsi
Kulak, R.F., and Schwer, L.E., "Effect of Soil Material Models on SPH Simulations for Soil-
Structure Interaction", 12th International LS-DYNA Users Conference, Dearborn, Michigan,
June, 2012.
http://www.dynalook.com/international-conf-2012/fsi-ale23-d.pdf
Souli, M. and Shahrour, I., "A Coupling Method for Soil Structure Interaction Problems",
International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 27, Issue 9,
pp. 1140-1153, June, 2013.
The Lagrangian and ALE soil material behavior were represented by the *MAT_005 material
Model (data included) in the following paper:
Souli, M. and Shahrour, I., "Arbitrary Lagrangian Eulerian Formulation for Soil Structure
Interaction Problems", Soil Dynamics and Earthquake Engineering", Vol. 35, pp. 72-79, April,
2012.
https://munin.uit.no/handle/10037/11283
---------------------------------
Sincerely,
James M. Kennedy
KBS2 Inc.
March 31, 2022
Hi,
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