# Grid changes whith time variation

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 August 31, 2001, 04:34 Grid changes whith time variation #1 H.P.LIU Guest   Posts: n/a I am trying to solve the problem with grid change according to the time variation (i.e.the solution domain demension changes with time). Can I use deactive and active the part of the solution demension during the solution? How to deal with this kind of problem? Thank for your help ps: I have PHONICS 3.3 for WinNT Messages

 August 31, 2001, 05:35 Re: Grid changes whith time variation #2 Kike Guest   Posts: n/a Dear Liu Try to be a little more specific. I couln't understand your first question? What do you mean with "deactive and active part of the solution dimension"? Regards Kike

 September 1, 2001, 06:44 Re: Grid changes whith time variation #3 H.P.LIU Guest   Posts: n/a Generally, PHONEICS always solves a problem with the fixed domain size which must be set at the beginning of solving so as to establish the grid. but I have a problem whose domain size changs with time i.e. domain size is a function of time. Deactivating and activating is a concept used for other softwares. which meanings is that the part of the domain can be controlled to not to parcipate in and participate in solution as time goes while the whole domain remains unchange.

 September 1, 2001, 07:53 Re: Grid changes whith time variation #4 Kike Guest   Posts: n/a Dear Liu You can control the region in which the solve variables has physical sense by means of "porosity" (see EPOR in POLIS). PHOENICS multiplies every cell face area by its porosity (EPOR, NPOR and HPOR) during the calculation procedure. In such a way you can restrict the solution/results to certain number of cells inside your domain. Of course, to determine the cell indexes you will have to program inside GROUND according the time evolution you have. Another way is to control the action of terms inside each equation by means of patches (Group 12). It is applied in combined studies fluid-flow solid-stress inside the domain. Again, you will have to control the patches' limits. Regards Kike

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