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Regularization of Two-Phase Flow Models: A Comparison of Numerical and Differential Approaches

✍ Scribed by Himanshu Pokharna; Michitsugu Mori; Victor H. Ransom

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
445 KB
Volume
134
Category
Article
ISSN
0021-9991

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✦ Synopsis

the dynamic character of two models. To this latter end, we will present dispersion analysis results first for the This paper illustrates the dominant role that numerical damping plays in the regularization of the two-phase flow models used in RELAP5 and CATHARE differential models and then the RELAP5 and CATHARE codes. Dispersion analysis for a practical for the corresponding numerical models for each using a range of wave-number is used to examine the stability characterissemi-implicit numerical scheme. The results of this analysis tics of both differential and numerical implementations of the two clearly reveal the dominant and necessary regularizing efmodels. In this study it was found that numerical damping overfect of the numerical scheme for both of these models.

shadows the effect of differential terms when they were added specifically to achieve a well-posed differential model such as is done for some flow regimes in the CATHARE code. Furthermore

1.1. Physical Characteristics of Two-Phase Systems

the added terms can result in non-physical dynamic behavior of the model.

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