tailorcrete:examples:slump-flow
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tailorcrete:examples:slump-flow [2012/07/17 12:02] – 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 ==== | ||
+ | This test is a typical test used to check consistency of a fresh concrete suspension, often used in laboratories and on site. The mould called slump cone is filled with concrete and then is lifted up by hand. Conrete slumps down due to gravity forces. Typically, the residual height and spreading diameter are recorded. In the presented example, the geometry of Abrams cone has been choosen (see the Fig. 1 for dimensions). | ||
- | This section presents results of slump flow simulations. The problem is solved in axisymmetric | + | |{{: |
- | setting due to the rotational symmetry | + | |Fig.1: The geometry |
- | Bingham model (corresponding to self compacting concrete with very low yield stress) with the | + | |
- | following parameters: density 2300 kg/m3, yield stress 40 Pa, viscosity 20 Pa.s. The simulations were performed for | + | |
- | different type of friction conditions assumed on horizontal plate. The full slip as well as | + | |
- | different friction coefficients has been considered. The friction coefficient is sequentially equal to 0.0, 0.01, 0.1 and 5.0. Significant difference in flows for different friction coefficient can be observed. | + | |
+ | ==== Computational Model ==== | ||
+ | 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 is modeled as a two-phase flow problem, considering fresh concrete and air as the two immiscible phases. The mutual interface between the twofluids is tracked using the Level Set Method [2]. The air phase is modeled as a newtonian fluid, the fresh concrete suspension as non-Newtonian, | ||
+ | *density 2300 kg/ | ||
+ | *yield stress 40 Pa, | ||
+ | *viscosity 20 Pa.s. | ||
+ | The simulations were performed with different type of friction conditions assumed on horizontal plate. The full slip as well as | ||
+ | different friction coefficients have been considered. The friction coefficient has been set to 0.0, 0.01, 0.1 and 5.0. A significant difference in flow patterns for different friction coefficient can be observed. | ||
+ | |{{: | ||
+ | |Fig. 2: The setup of the computatinal model|Fig.3: | ||
- | {{: | ||
- | The mesh is shown on the next picture. It is refined near the botom surface to improve accuracy of the interface capturing. | + | The computational |
- | {{: | + | The example of OOFEM input file is available here: {{: |
- | On the next four videos, the influence of boundary condition on the flow is shown. The friction coefficient | + | ==== Results ==== |
+ | On the next four videos, the influence of boundary condition on the flow is illustrated. The Different values of friction coefficient | ||
- | {{: | + | |{{video> |
+ | |Friction coefficient 0.0 | Friction coefficient 0.01 | | ||
+ | |{{video> | ||
+ | |Friction coefficient 0.1 | Friction coefficient 5.0 | | ||
- | {{: | + | On the next figure, the overall influence of friction is illustrated. Final spreading shape of SCC is plotted for different values of friction coefficient. Comparison with analytical solution of simplified problem is made (for further reference, see: [1]) |
- | {{: | + | |{{: |
+ | |Fig. 4: Final spreading shape or different values of friction coefficient.| | ||
- | {{:tailorcrete: | + | ==== References ==== |
+ | [1] ROUSSEL N COUSSOT P, “Fifty-cent rheometer” for yield stress | ||
+ | measurements | ||
+ | 705-718.) | ||
- | Example input file is here: {{: | + | [2] BARTH, T.; SETHIAN, J.A. (2009), Numerical Schemes for the HamiltonJacobi and Level Set Equations on Triangu- |
- | + | lated Domains. Journal | |
- | Description | + | |
+ | [3] TEZDUYAR, T : Stabilized Finite Element Formulations for Incompressible Flow Computations, | ||
+ | Applied Mechanics, Volume 28, 1991, Pages 1-44 | ||
tailorcrete/examples/slump-flow.1342519357.txt.gz · Last modified: 2012/07/17 12:02 by kolarfil