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 June 6, 2006, 08:23 About fluid surface #1 jasonchang Guest   Posts: n/a Hi,all I am use cfx to simulate water filling into a vessel . It's a transient model. How can I get the surface of water in the filling?I want show it in the animation. Any suggestion will be appreciated. Jason.

 June 6, 2006, 10:08 Re: About fluid surface #2 Robin Guest   Posts: n/a Create an isosurface of volume fraction 0.5 or plot volume fraction on a surface. To close the walls, follow these steps: 1. Create a contour plot of volume fraction between 0 and 1 with three contour levels. Hide the contour. 2. Create a user surface using the "From Contour" method. Pick the contour plot you created in step 1 and set the contour level to 2 (or 3 depending on whether you picked air or water fraction). Optionally, if you want combined control of the coloring, create a Surface Group and include your User Surface and Isosurface. Colour to taste and add transparency to wow your friends! Regards, Robin

 June 7, 2006, 09:48 Re: About fluid surface #3 Jasonchang Guest   Posts: n/a Hi Robin, Thank you for your help.I'll try it . By the way ,I have another question: The tank filling model,with air in it ,but the pressure in it is very low,about 1000Pa. The inlet only allow water flow into the vessel .Shoule I use two phase model,set the inlet like this,water Volume Fraction 1,air Volume Fraction 0;homogeneou model;set the air Dispersed phase? Regards,Jason

 June 7, 2006, 21:32 Re: About fluid surface #4 Robin Guest   Posts: n/a Homogenous with free surface should be fine with water as the continuous phase (this doesn't matter so much when free surface option is selected). Volume fraction of 1 for water and 0 for air will introduce only water at the inlet. If you specify a mass flow rate or velocity at your inlet, you will run into problems without an outlet when the tank finishes filling. Make sure the air phase is compressible. -Robin

 June 7, 2006, 22:30 Re: About fluid surface #5 jasonchang Guest   Posts: n/a Hi,Robin As the air is very few and compressive,I needn't set an outlet of the vessel.Indeed the inlet is at the bottom and there's no outlet. I set the isosurface ,contour,user surface and user surface just as you said,but still have some question. where should the contour be located? I set the user surface and surface group and nothing appeared. I am a beginner .Too many things haven't been got. Thank you sincerely. Regards, Jason

 June 8, 2006, 08:45 Re: About fluid surface #6 Robin Guest   Posts: n/a Hi Jason, You need to walk before you run. Have you been through the tutorials or taken training? For the tips I gave, locate the contour plot on the outer boundaries. You can select multiple regions by clicking the [...] button beside the location selector and control-clicking on the desired locations. This is a transient analysis. Are you writing TRN files at each iteration (or at least periodically)? What variables did you include in the trn files? Regards, Robin

 June 9, 2006, 03:37 Re: About fluid surface #7 jasonchang Guest   Posts: n/a Hi,Robin: I have been run the simulation,but I think there are still some mistakes I set. e.g,the pressure in the domain is 1000Pa,almost in vacuum.Perhaps I can't use the 'air at 25C' because the density and some other phsical properties is changed.Maybe I should add a new material by myslef. I wrote TRN files at each iteration ,but not include variables in the trn files.Maybe it is just the reason I failed. By the way,How to set the air phase compressible? Thank you for having given me so many advices. Regards,Jason

 June 9, 2006, 09:17 Re: About fluid surface #8 Robin Guest   Posts: n/a I don't mean to be rude Jason, but you should really think a little more before you begin. STP means Standard Temperature and Pressure... are you running at Standard Temperature and Pressure.... No! Don't get me started on writing a TRN file and not including variables! Read some documentation, run a few tutuorials, then come back and ask questions. If you are a student, pray that your prof is not reading this forum. Regards, Robin

 June 9, 2006, 20:53 Re: About fluid surface #9 jasonchang Guest   Posts: n/a Thank you all the same. I try it by myself. Regurds,Jason

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