tailorcrete:examples:slump-flow
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tailorcrete:examples:slump-flow [2012/07/25 15:37] – kolarfil | tailorcrete:examples:slump-flow [2012/09/13 09:54] (current) – improved formatting, corrected some typos bp | ||
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- | ==== Slump flow test ==== | + | ===== Slump flow test ===== |
- | === Test setup and Geometry === | + | ==== Test setup and Geometry |
- | This section presents results of slump flow simulations. It is a typical test usually | + | This test is a typical test used to check consistency of a fresh concrete |
- | {{: | + | |{{: |
+ | |Fig.1: The geometry of Abrams cone slump test| | ||
- | === Computational Model === | + | ==== Computational Model ==== |
- | The problem is modeled in axisymmetric setting | + | Due to the rotational symmetry, the problem is modeled in axisymmetric setting. The setup of computational domain, together with the description of boundary conditions and used materials is illustrated on Fig. 2. The whole problem |
- | Bingham model (corresponding to self compacting | + | *density 2300 kg/ |
- | following parameters: density 2300 kg/m3, yield stress 40 Pa, viscosity 20 Pa.s. The simulations were performed | + | *yield stress 40 Pa, |
- | different type of friction conditions assumed on horizontal plate. The full slip as well as | + | *viscosity 20 Pa.s. |
- | different friction coefficients | + | The simulations were performed |
+ | different friction coefficients | ||
- | {{: | + | |{{: |
+ | |Fig. 2: The setup of the computatinal model|Fig.3: | ||
- | === Results === | ||
- | On the next four videos, the influence of boundary condition on the flow is shown. The friction coefficient is sequentially equal to 0, 0.01, 0.1 and 5. Parameters of the concrete are always yield stress 40 Pa and plastic viscosity 20 Pa.s. Density is 2300kg/ | ||
- | {{: | + | The computational mesh is shown on the Figure 3. It has been refined near the botom surface to improve accuracy of the boundary layer prediction as well as improved interface capturing. The triangular elements with eqaul order interpolation of velocity and pressure fields have been used. Since that element is not satisfying LBB condition, PSPG stabilization is used for preventing oscilations in pressure field. SUPG stabilization improving accuracy in connection with non-linear convective term is also used. For further information, |
- | {{: | + | The example of OOFEM input file is available here: {{: |
- | {{: | + | ==== Results ==== |
+ | On the next four videos, the influence of boundary condition on the flow is illustrated. The Different values of friction coefficient were assumed (equal to 0, 0.01, 0.1 and 5.). Parameters of the Bingham model for concrete were following: yeld stress 40 [Pa], plastic viscosity 20 [Pa.s], and density 2300 [kg/m3]. | ||
- | {{: | + | |{{video> |
+ | |Friction coefficient 0.0 | Friction coefficient 0.01 | | ||
+ | |{{video> | ||
+ | |Friction coefficient 0.1 | Friction coefficient 5.0 | | ||
- | On the next figure, influence of friction is shown. Final spreading shape of SCC is plotted for different values of friction. Comparison with analytical solution of simplified problem is made (for further reference, see: ROUSSEL N COUSSOT P, “Fifty-cent rheometer” for yield stress | + | On the next figure, |
- | measurements : from slump to spreading flow, Journal of Rheology, 49(3) (2005) | + | |
- | 705-718.) | + | |
- | {{: | + | |{{: |
+ | |Fig. 4: Final spreading shape or different values of friction coefficient.| | ||
- | Example input file is here: {{: | + | ==== References ==== |
+ | [1] ROUSSEL N COUSSOT P, “Fifty-cent rheometer” for yield stress | ||
+ | measurements | ||
+ | 705-718.) | ||
- | Description of input file can be found here: [[tailorcrete: | + | [2] BARTH, T.; SETHIAN, J.A. (2009), Numerical Schemes for the HamiltonJacobi and Level Set Equations on Triangu- |
+ | lated Domains. Journal of computational physics, 145 1-40. | ||
+ | [3] TEZDUYAR, T : Stabilized Finite Element Formulations for Incompressible Flow Computations, | ||
+ | Applied Mechanics, Volume 28, 1991, Pages 1-44 | ||
tailorcrete/examples/slump-flow.1343223456.txt.gz · Last modified: 2012/07/25 15:37 by kolarfil