STATUS OF THE COUPLED FLUID - STRUCTURE DYNAMICS CODE SEURBNUK
The computer code SEURBNUK-2 is used collaboratively for the study of fast reactor containment integrity. Continuous extension and improvement of the numerical modelling has been required to match the performance of the code against the COVA series of scale model experiments and the requirements of reactor safety analysis. This article outlines the present capabilities of SEURBNUK-2 and summarises the most recent development topics. The motions of marker particles which define free surfaces are estimated by extrapolating from the neighbouring fluid velocity field. The choice of appropriate velocities close to a structure can be subjective, particularly at a free end or a corner, and this has often led to instability in the shape of the surface. A systematic method recently adopted to reduce this problem is described. As the free fluid surface sweeps out through the cells, cells that were boundary cells change their status to become fluid cells. In this case care must be taken to initialize the unknown quantities, otherwise large errors can easily be introduced if the field variables are changing rapidly. Examples are given to illustrate this point. An improvement in the portability of the code has been achieved by attending to Fortran protocol and non-standard features such as unassigned variables, generally modifying the program source in the direction of ANSI standard Fortran 77. This is consistent with the recently extended collaboration on development of the SEURBNUK code.
Bibliographic Reference: SMIRT-CONFERENCE, CHICAGO (USA), AUG 22-26, 1983 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 30992 ORA
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Record Number: 1989122037600 / Last updated on: 1987-01-01
Available languages: en