Improved laminar predictions using a stabilised time-dependent simple scheme
✍ Scribed by I. E. Barton
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 229 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0271-2091
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✦ Synopsis
A new scheme which can solve unsteady incompressible flows is described in this paper. The scheme is a variant of the SIMPLE methodology. Typically, a scheme of this type tends to suffer from stability problems, which this new scheme overcomes by taking small intermediate steps within a time step. The calculations made in the intermediate steps are damped to enhance the stability of the scheme. The new stabilised scheme is evaluated for laminar flow around a square cylinder, impulsively started laminar flow over a backward-facing step and fluctuating laminar flow over a backward-facing step. Comparisons are made with other numerical predictions and experimental data. In general, good agreement is found, except for the fluctuating laminar flow over a backward-facing step problem. The new scheme is found to have the same level of accuracy, stability and efficiency in comparison with the PISO scheme, but it is easier to code.