Post-processing

When the analysis is completed and the message Process '…', started on … has finished. has been displayed, we can proceed to visualise the results by pressing Postprocess.

For details on the result visualisation not explained here, please refer to the Post-processing chapter of the previous examples and to the GiD manual or GiD online help.

In this example, the obtained results will be very similar to those shown in section Example 5: 2D Cylinder. However we can see significant differences if we look at velocity results. Differences in the velocity fields are due to the fact that in the present example the external fluid is at rest, being perturbed by the movement of the cylinder. The evolution of the velocity field is shown in Figure 124.

t=60.0 s

t=62.0 s

t=64.0
s

t=66.0
s

t=68.0
s

t=70.0
s

t=72.0
s

t=74.0
s

t=76.0 s

t=78.0
s

Figure 124 Time evolution of velocity module


REFERENCES



[1] too large for the use of the academic version of Tdyn

[2] Too small in the sense that we obtain a number of nodes much less than the upper limit of the academic version. In this case we can still refine the mesh and improve the quality of the results, in order to take the maximum advantage of the academic version of Tdyn



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[[2]]   E. Oñate, and J. García-Espinosa, Advanced Finite Element Methods for Fluid Dynamic Analysis of Ships, MARNET-CFD Workshop, Crete, Athens, 2001.

[[3]]   E. Oñate, and J. García-Espinosa, A Finite Element Method for Fluid-Structure Interaction with Surface Waves Using a Finite Calculus Formulation, Comput. Methods Appl. Mech. Engrg. 191 (2001) 635-660.

[[4]]   E. Oñate and J. García-Espinosa. A methodology for analysis of fluid-structure interaction accounting for free surface waves. European Conference on Computational Mechanics (ECCM99). Munich, Germany, September 1999.

[[5]]   O. Soto, R. Löhner, J. Cebral and R. Codina. A Time Accurate Implicit-Monolithic Finite Element Scheme for Incompressible Flow. ECCOMAS 2001. Swansea UK 2001.

[[6]] Armaly, B. F., Durst, F., Pereira, J. C. F., Schönung, B., Experimental and theoretical investigation of backward-facing step flow. J. Fluid Mech. 127, 473-496, 1983.

[[7]] M. A. Cruchaga, A study of the backwards-facing step problem using a generalised streamline formulation. Communications in Numerical Methods in Engineering, 14, 697-708, 1998.

[8]   R. Codina, M. Vázquez and O.C. Zienkiewicz, A fractional step method for the solution of the compressible Navier-Stokes equations. Publication CIMNE no. 118, Barcelona 1997.

[9]   García, J., Oñate, E., Sierra, H., Sacco, C. and Idelsohn, S. A Stabilised Numerical Method for Analysis of Ship Hydrodynamics. Proceedings Eccomas Conference on CFD, 7-11 September 1998, Athens, John Wiley, 1998.

[10]J. García, A Finite Element Method for the Hydrodynamic Analysis of Naval Structures (in Spanish), Ph.D. Thesis, Univ. Politécnica de Cataluña, Barcelona, December 1999.

[11]GiD, A pre/postprocessing environment for generations of data and visualisation in finite element analysis. CIMNE, Barcelona, 1996.

[12]Löhner, R., Yang, E., Oñate, E. and Idelsohn, S. An Unstructured Grid-Based, Parallel Free Surface Solver. Presented in IAAA journal. CIMNE. Barcelona 1996.

[13]E. Oñate, J. García and S. Idelsohn, On the stabilisation of numerical solutions of advective-diffusive transport and fluid flow problems. Comp.Meth. Appl. Mech. Engng, 5, 233-267, 1998

[14]Oñate, E., Idelsohn, S. and Sacco, C. Numerical Solutions for the ship drags problems using no-moving free surface boundary conditions. Research Report, CIMNE, Barcelona 1996.

[15]Phang, V., Incompressible finite element Navier Stokes solution with adaptive remeshing techniques, Final Year Project, Imperial College, London/ CIMNE, Barcelona 1998.

[16]Roshko, A., On the development of turbulent wakes from vortex streets, NACA report 1191, 1954.

[17]M. Vázquez, R. Codina and O.C. Zienkiewicz, A general algorithm for compressible and incompressible flow. Part I: The split characteristic based scheme. Int. J. Num. Meth. in Fluids, 20, 869-85, 1995

[18]M. Vázquez, R. Codina and O.C. Zienkiewicz, A general algorithm for compressible and incompressible flow. Part II: Tests on the explicit form. Int. J. Num. Meth. in Fluids, 20, No. 8-9, 886-913, 1995.