doc:user:elements:volumes:fluid_iso_hypo_materials
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doc:user:elements:volumes:fluid_iso_hypo_materials [2016/04/01 16:16] – [FluidHypoMaterial] carretta | doc:user:elements:volumes:fluid_iso_hypo_materials [2017/12/01 12:11] (current) – [NortonHoffHypoMaterial] boemer | ||
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<note warning> | <note warning> | ||
- | Convergence when using this law may be difficult to achieve since there is no stiffness when shearing the material. If you encounter this kind of isssue, you may used **NortonHoffHypoMaterial** discussed below with a low viscosity parameter and NORTON_M = 1 to model a Newtonian fluid. | + | Convergence when using this law may be difficult to achieve since there is no stiffness when shearing the material. If you encounter this kind of issue, you may use **NortonHoffHypoMaterial** discussed below with a low viscosity parameter and NORTON_M = 1 to model a Newtonian fluid. |
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=== Description === | === Description === | ||
- | Norton-Hoff law descriding | + | Norton-Hoff law describing |
Stresses are computed with | Stresses are computed with | ||
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<note warning> | <note warning> | ||
- | To model low viscosity | + | To model Newtonian fluid with low viscosity (0.3 Pa.s for instance) it is important to use SRI elements instead of SRIPR. Indeed, SRIPR elements might induce oscillations in pressure and velocity fields. This seems to come from the different pressure |
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<note important> | <note important> | ||
- | Boundary conditions might also have a huge impact on the convergence and the validity of the results. It is therefore crucial to check the way the elements deform along the boundaries and the corners. | + | Boundary conditions might also have a huge impact on the convergence and the validity of the results. It is therefore crucial to check the way the elements deform along the boundaries and the corners. From these observations, |
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<note warning> | <note warning> | ||
- | A good compromise must be reached between the elements size and the time step value. If elements are too small, low viscous fluid elements may reach configurations where Negative | + | A good compromise must be reached between the elements size and the time step value. If elements are too small, low viscous fluid elements may reach configurations where the Jacobian |
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doc/user/elements/volumes/fluid_iso_hypo_materials.1459520215.txt.gz · Last modified: 2016/04/01 16:16 by carretta