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tailorcrete:examples:slump-flow [2012/09/13 09:48] – Reformatted, languange check bptailorcrete:examples:slump-flow [2012/09/13 09:54] (current) – improved formatting, corrected some typos bp
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 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 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). 
  
-{{:tailorcrete:abrams_cone_geom.png?300|Fig.1: The geometry of Abrams cone slump test}}+|{{:tailorcrete:abrams_cone_geom.png?300|Fig.1: The geometry of Abrams cone slump test}}| 
 +|Fig.1: The geometry of Abrams cone slump test|
  
 ==== Computational Model ==== ==== Computational Model ====
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 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. 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.
  
-{{:tailorcrete:examples:slump_bc2.png?300|Fig. 2: The setup of the computatinal model}}+|{{:tailorcrete:examples:slump_bc2.png?400|Fig. 2: The setup of the computatinal model}}|{{:tailorcrete:examples:slum_mesh.png?400|Fig.3: The computational mesh}}| 
 +|Fig. 2: The setup of the computatinal model|Fig.3: The computational mesh| 
  
 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, see [3].  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, see [3]. 
- 
-{{:tailorcrete:examples:slum_mesh.png?300|Fig.3: The computational mesh}} 
- 
  
 The example of OOFEM input file is available here: {{:tailorcrete:examples:slump_beta0.01_tau40.0_mu20.0_oofem.in|}}, desription of input parameters can be found here: [[tailorcrete:input_file_description|Input File Description]] The example of OOFEM input file is available here: {{:tailorcrete:examples:slump_beta0.01_tau40.0_mu20.0_oofem.in|}}, desription of input parameters can be found here: [[tailorcrete:input_file_description|Input File Description]]
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 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].  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>http://www.oofem.org/wiki/lib/exe/fetch.php?:tailorcrete:examples:slump_beta0.0_tau40_mu20.avi|}} | {{video>http://www.oofem.org/wiki/lib/exe/fetch.php?:tailorcrete:examples:slump_beta0.01_tau40_mu20.avi|}}|+|{{video>http://www.oofem.org/wiki/lib/exe/fetch.php?media=tailorcrete:examples:slump_beta0.0_tau40_mu20.avi|}} | {{video>http://www.oofem.org/wiki/lib/exe/fetch.php?media=tailorcrete:examples:slump_beta0.01_tau40_mu20.avi|}}|
 |Friction coefficient 0.0 | Friction coefficient 0.01 | |Friction coefficient 0.0 | Friction coefficient 0.01 |
-|{{video>http://www.oofem.org/wiki/lib/exe/fetch.php?:tailorcrete:examples:slump_beta0.1_tau40_mu20.avi|}} | {{video>http://www.oofem.org/wiki/lib/exe/fetch.php?:tailorcrete:examples:slump_beta5_tau40_mu20.avi|}}|+|{{video>http://www.oofem.org/wiki/lib/exe/fetch.php?media=tailorcrete:examples:slump_beta0.1_tau40_mu20.avi|}} | {{video>http://www.oofem.org/wiki/lib/exe/fetch.php?media=tailorcrete:examples:slump_beta5_tau40_mu20.avi|}}|
 |Friction coefficient 0.1 | Friction coefficient 5.0 | |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 coefficint. Comparison with analytical solution of simplified problem is made (for further reference, see: [1])+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])
  
-{{:tailorcrete:examples:slump_tau40_mu20.png?300|}}+|{{:tailorcrete:examples:slump_tau40_mu20.png?600|}}| 
 +|Fig. 4: Final spreading shape or different values of friction coefficient.|
  
 ==== References ==== ==== References ====
tailorcrete/examples/slump-flow.1347522538.txt.gz · Last modified: 2012/09/13 09:48 by bp