# filter question

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 July 27, 2007, 11:53 filter question #1 istvan Guest   Posts: n/a Hi, I have to simulate a tap, but at the vater inlet there is a filter, to filter out contamination from water. Is there an easy way to do this, withot modelling the filter geometry? Thanks: István

 July 27, 2007, 16:54 Re: filter question #2 Robin Guest   Posts: n/a Are you modeling both sides of the filter, or is it just at the outlet? -Robin

 July 28, 2007, 14:10 Re: filter question #3 istvan Guest   Posts: n/a Thanks Robin. There is water flowing through a tap (valve). There is a filter built in close to the inlet of the tap. I would like to ask, if it possible somehow to put a surface where the filter is, and to set the loss coefficient across this surface. Istvan

 July 30, 2007, 09:07 Re: filter question #4 Robin Guest   Posts: n/a Yes. If the filter is at the inlet, define it as an [i]Opening<\i> and use the [i]Static Pressure<\i> option. In the details panel you will find a check box for defining the loss coefficient. Enabling this option makes your specified pressure a reference pressure and the actual static pressure a function of this, the loss coefficient and the local flow rate. Alternatively, if the inlet is upstream of the filter, split your grid (in CAD or when you create it in ICEM CFD) at the filter location and put a [i]Domain Interface<\i> at this location (note that you don't need separate domains to add a domain interface and the grid can still be 1:1). With version 11 you can specify a pressure drop at this interface, so just define you pressure drop as a function of the local speed and a reference pressure using CEL expression. Regards, Robin

 July 31, 2007, 11:45 Re: filter question #5 istvan Guest   Posts: n/a Thank you very much. I'll try the second alternative. BR/István

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