The aim of this test case is to validate the following functions:

- centrifugal force

The simulation results of SimScale were compared to the numerical results presented in [HPLA100]. The mesh used in (A) and (C) was created with the automatic-tetrahedralization-tool on the SimScale platform. The mesh used in (B) und (D) was created locally.

Import validation project into workspace

A | B | C | D | |
---|---|---|---|---|

x [m] | 0.0195 | 0.0205 | 0.0205 | 0.0195 |

y [m] | 0 | 0 | 0 | 0 |

z [m] | 0.01 | 0.01 | 0 | 0 |

To obtain the solid body the face ABCD is rotated 45° around the z-axis. Because of the symmetry of the cylinder only one quarter was modelled.

**Tool Type** : Code_Aster

**Analysis Type** : Static

**Mesh and Element types** :

Case | Mesh type | Number of nodes | Element type |
---|---|---|---|

(A) | quadratic tetrahedral | 2893 | 3D isoparametric |

(B) | quadratic hexahedral | 2583 | 3D isoparametric |

(C) | quadratic tetrahedral | 17460 | 3D isoparametric |

(D) | quadratic hexahedral | 9285 | 3D isoparametric |

Material:

- isotropic: E = 200 GPa, ν = 0.3, ρ = 8000 kg/m
^{3}

Constraints:

- Face AA’BB’ and face CC’DD’ zero z-displacement
- Symmetry boundary condition on face ABCD and A’B’C’D’

Loads:

- Centrifugal force with a rotational speed = ω = 1 rad/s around the z-axis applied on the whole body

$$u(r) = \frac{-(1+\nu)(1-2\nu)}{(1-\nu)E} \rho \omega^2 \frac{r^3}{8} + Ar + \frac{B}{r}$$

$$\sigma_{zz}(r) = \frac{-\nu}{(1-\nu)} \rho \omega^2 \frac{r^2}{2} + \frac{2 \nu E}{(1+\nu)(1-2\nu)} A$$

$$A = \frac{(3-2\nu)(1+\nu)(1-2\nu)}{4(1-\nu)E} \rho \omega^2 R^2 (1-x^2) = 7.13588 \cdot 10^{-12}$$

$$B = \frac{(3-2\nu)(1+\nu)}{8(1-\nu)E} \rho \omega^2 R^4 (1-x^2)^2 = 3.561258 \cdot 10^{-15} m^2$$

$$x = \frac {h} {2R} = \frac {0.001m} {2 \cdot 0.02 m} = 0.025$$

All stated equations used to solve the problem are derived in [HPLA100]. The parameters h and R in (5) are the thickness of the cross section and the radius of the middle surface of the cylinder respectively.

Important

The values for the comparison of the displacement ur and the stresses σzz are averaged over on edge and an area respectively

Comparison of the displacement U_{r} and the stresses \(\sigma_{zz}\) of the inner and the outter face obtained with SimScale and the results derived from [HPLA100].

Case | Quantity | [HPLA100] | SimScale | Error |
---|---|---|---|---|

(A) | \(U{r}\) (r=0.0195m) [m] | 2.9424E-013 | 2.83491E-013 | 3.653% |

(A) | \(U{r}\) (r=0.0205m) [m] | 2.8801E-013 | 2.8972E-013 | -0.594% |

(A) | \(\sigma_{zz}\) (r=0.0195m) [N/m^{2}] |
0.99488 | 0.992259 | 0.263% |

(A) | \(\sigma_{zz}\) (r=0.0205m) [N/m^{2}] |
0.92631 | 0.929711 | -0.367% |

(B) | \(U{r}\) (r=0.0195m) [m] | 2.9424E-013 | 2.94195E-013 | 0.015% |

(B) | \(U{r}\) (r=0.0205m) [m] | 2.8801E-013 | 2.87966E-013 | 0.015% |

(B) | \(\sigma_{zz}\) (r=0.0195m) [N/m^{2}] |
0.99488 | 1.00893 | -1.412% |

(B) | \(\sigma_{zz}\) (r=0.0205m) [N/m^{2}] |
0.92631 | 0.914645 | 1.259% |

(C) | \(U{r}\) (r=0.0195m) [m] | 2.9424E-013 | 2.94234E-013 | 0.002% |

(C) | \(U{r}\) (r=0.0205m) [m] | 2.8801E-013 | 2.88003E-013 | 0.002% |

(C) | \(\sigma_{zz}\) (r=0.0195m)[N/m^{2}] |
0.99488 | 0.995217 | -0.034% |

(C) | \(\sigma_{zz}\) (r=0.0205m) [N/m^{2}] |
0.92631 | 0.926616 | -0.033% |

(D) | \(U{r}\) (r=0.0195m) [m] | 2.9424E-013 | 2.94237E-013 | 0.001% |

(D) | \(U{r}\) (r=0.0205m) [m] | 2.8801E-013 | 2.88007E-013 | 0.001% |

(D) | \(\sigma_{zz}\) (r=0.0195m) [N/m^{2}] |
0.99488 | 0.994995 | -0.012% |

(D) | \(\sigma_{zz}\) (r=0.0205m) [N/m^{2}] |
0.92631 | 0.926415 | -0.011% |

[HPLA100] | (1, 2, 3, 4) HPLA100 – Cylindre creux thermoélastique pesanten rotation uniforme |