Commercial Models Analysis

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Commercial Models Analysis

Presentation

Nowadays, there are many commercial tools for discharge modeling and some of them are adapted to simulate negatively buoyant effluents, such as brine. These tools solve the numerical equations with different approaches, considering the most relevant processes affecting the flow behavior.

CORMIX, VISUAL PLUMES and VISJET are some of the most notable commercial software for brine discharge modeling. The models predict the brine behavior considering the effluent properties, the disposal configuration and the ambient conditions. Commercial models are often used by developers to design the discharge system and by the environmental authorities to predict the potential marine impact and the achievement of the water quality standards established.

In order to obtain a better knowledge of the theoretical basis and the use of the tools utilized by the promoters and environmental authorities, these commercial programmes have been studied and analyzed in depth; considering: theoretical basis, simplifying assumptions, components and modeling options, capabilities and limitations and recommendations for implementation and management. The critical assessment and validation has included the following commercial models, referred to brine discharge through jets into stagnant and dynamic environments.


CORMIX software VISUAL PLUMES software VISJET software
CORMIX 1: submerged and emerged single port jet.
CORMIX 2: submerged multiport jets
D-CORMIX: Direct surface discharge
CORJET: submerged single and multi-port jets
UM3: submerged jets single and multi-port
JetLag; submerged jets single and multi-port

As a result of the analysis and validation carried out, the following two scientific articles have been developed and published in Desalination magazine:

Palomar, P, L.Lara,J, Losada, I, Rodrigo, M; Alvarez, A. (2012). “Near Field brine discharge modelling. Part 1: Analysis of commercial tools”. Desalination, vol. 290, pp. 14 – 27.

Palomar, P. Lara, L.J; Losada, I.J. (2012). “Near field brine discharge modelling Part 2: Validation of commercial tools”. Desalination, vol. 290, pp. 28 – 42.

The following conclusions are set up from the critical assessment carried out:

- Models based on the integration of differential equations are not recommended for initial discharge angles (relative to the bottom) over 75º and under 30º, since re-entrainment and COANDA phenomena respectively are not taken into account.
- Although CORMIX2 offers multiple possibilities for multiport diffuser configuration, important assumptions are made for some of them, which invalidate its results for dense jets.
- For a stagnant ambient, validation carried out in the present work shows that CORJET, UM3 and JetLag models underestimate jet dimensions in all cases. With respect to dilution at the impact point, all models significantly underestimate the values (differences around 60%).
- For a dynamic environment, significant errors have been detected related to the influence of the ambient current´s direction on the behavior of dense jets. Commercial models seem not to follow the trend of experimental results published by Roberts et al. (1988) since they are almost insensitive to ambient current direction.

For more information regarding the critical assessment and validation of commercial models, you can contact us at: medvsa@ihcantabria.com