# regarding patch in two phase flow using VOF

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 October 3, 2005, 01:06 regarding patch in two phase flow using VOF #1 rashmi Guest   Posts: n/a hi all iam doing simulation on oil-water flow..i want to enter the values of volume fraction of both the phases...so i adapted the region where i want to give the volume fraction.and then initialized the soln and then trying to patch using solve---->initialize---->patch..but in phase drop down list in patch window it is showing only oil and mixture as option and not the water..... does anyone know how do i do this.... thanks in advance rashmi

 October 3, 2005, 01:29 Re: regarding patch in two phase flow using VOF #2 John Guest   Posts: n/a Hi Rashmi, To patch a water fraction of 1, you just need to patch an oil fraction of 0. Whatever your input is for the oil volume fraction, the water fraction will be 1 minus that fraction. Regards, John.

 October 3, 2005, 01:54 Re: regarding patch in two phase flow using VOF #3 Manoj Kumar Guest   Posts: n/a Hi When you have two phases, oil and water, then 1st initialize all the cells (the whole domain) with volume fraction of water=1 in the solution initialization window. And then select (using adaption window) the cells where you want oil, and initialize those cells with vf-oil=1 in the patch window. In the patch window, you will find only mixture and secondary phases and not the primary phase. You can use mixture to initialize other values like pressure, velocity.. in the selected cells. Regards Manoj

 October 3, 2005, 06:21 Re: regarding patch in two phase flow using VOF #4 rashmi Guest   Posts: n/a thanks manoj, but whn u initialize the volume fraction in domain there also u dont have to key in the vf of water...there is also you hav enter the vf of oil... i have to give vf of 0.2 to oil and .8 to water...can u expalin.. thanks rashmi

 October 3, 2005, 07:47 Re: regarding patch in two phase flow using VOF #5 Manoj Kumar Guest   Posts: n/a Hi Rashmi Do you want to initialize the whole domain with vf of oil=0.2 and vf of water=0.8 ? If so, then just initialize the cells with vf of oil=0.2 . This automitically ensures that your cells have vf of water=(1-vf of oil) i.e. 0.8 Good luck. Manoj

 October 4, 2005, 01:52 Re: regarding patch in two phase flow using VOF #6 rashmi Guest   Posts: n/a hi manoj, cn u explain how do i initialize the whole domain..my mixture velocity is 2m/s... so i adapted the region and did patch the vf of oil...cn it work.... one more thing is iam getting reversed flow in outflow...how do i avoid this...how to increase the domain size...plz explain thank u very much regards rashmi

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post simvun OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 48 May 14, 2012 06:20 ivanyao OpenFOAM Running, Solving & CFD 2 March 11, 2009 04:34 zidouni FLUENT 1 February 27, 2008 06:46 Charles FLUENT 3 May 20, 2006 13:25 youngan CFX 0 June 30, 2003 03:32

All times are GMT -4. The time now is 01:55.

 Contact Us - CFD Online - Top