Boundary condition convective boundary fluid-solid

 Register Blogs Members List Search Today's Posts Mark Forums Read

 August 20, 2013, 04:54 Boundary condition convective boundary fluid-solid #1 New Member   Richard Join Date: Aug 2013 Location: Zilina, Slovakia Posts: 20 Rep Power: 4 I would like use boundary condition (sufraceGradient=k*(A-Ainf)), where k is constant, A is value at surface of solid and Ainf is value of air. I used groovyBC, it works, but are here other posibilities? I would like calculate surface value A from other fields, and groovyBC uses only average values of other field. Thanks Richard

 August 22, 2013, 03:49 #2 New Member   Richard Join Date: Aug 2013 Location: Zilina, Slovakia Posts: 20 Rep Power: 4 Hello, if i understood correctly fixedGradient is gradient between surface and central point. code from "fixedGradientFvPatchField.H" Code:  x_p = x_c + \frac{\nabla(x)}{\Delta} where x_p | patch values x_c | internal field values \nabla(x)| gradient (user-specified) \Delta | inverse distance from patch face centre to cell centre Is any possibility how to set gradient between surface and ambient? Thanks Richard

 September 2, 2013, 04:15 #3 New Member   Richard Join Date: Aug 2013 Location: Zilina, Slovakia Posts: 20 Rep Power: 4 Hello, I used explicit scheme to calculate boundary values and then implicit scheme to calculate field centre values. It is conditionaly stable, but it works... Does not exist easier method? Something like using only half element on boundary, center point will be on boundary and will be solved with field values in matrix? Thanks Richard

 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 hinca CFX 15 January 26, 2014 18:11 Mavier CFX 5 April 29, 2013 00:00 smillion OpenFOAM 0 May 9, 2010 21:05 bioman66 CFX 5 June 3, 2006 01:40 hdj CFX 1 November 27, 2005 08:15

All times are GMT -4. The time now is 23:34.