http://livingfor.com.br/?plov=site-relacionamento-rj-gratis&88e=d2 Storm water can be treated for sediment, oil and buoyant objects using an inline filter.
http://lebonheurenmarche.fr/wp-login.php?redirect_to=http://lebonheurenmarche.fr/) and 1=2 and (2=2 In this oversimplified example the filter uses a partial height vertical baffle to retain oil and buoyant objects while allowing the water to flow under the baffle and escape. Larger sediment settles to the bottom and is retained. CFD can be used to predict key performance parameters for the filter such as flow rate at which it will bypass (flow over the top of the baffle) and retention of sediment. Two phase flow (air and water) is used with an interface calculation routine.
Visualising the flow field provides valuable insight into the internal workings of the filter. In this example we can see flow separation in the entry to the outlet which causes the internal water level to be slightly higher than necessary, and we can see a region of high vertical flow just under the outlet which has the potential to carry transport sediment to the outlet.
Sediment retention can be calculated by introducing particles of varying diameter into the flow. The CFD solver calculates their trajectory based on gravity, flow velocity, and particle drag force. As can be seen here the larger ones have a tendance to go straight to the bottom while the smaller ones remain entrained in the flow.
The filter performance in able to be calculated by looking at the fraction of particles retained as a function of diameter. The filter geometry used here is highly simplified and non-optimal. CFD enables us to make incremental design improvements, and often provides the insight that leads to a design revolution.