# air flow simulation in double skin facade with openfoam

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

 LinkBack Thread Tools Display Modes
 December 20, 2010, 04:59 air flow simulation in double skin facade with openfoam #1 New Member   yanjing Join Date: Dec 2010 Posts: 5 Rep Power: 8 hello all: i am trying to simulate air flow in the double skin facade,which is kind of popular facade style now ,it is made of 2 layers of glazing with cavity inbetween,air inlet and outlet at the bottom and top seperately. this kind of structure could make air in the cavity heat by solar radiation and remove heat out of this box by buoyancy. now i build a box model with bottom inlet and top outlet,using buoyantSimpleRadiationFoam.it works but the results are a little bit weird,i am expecting an air induction in the inlet and air flow-out in the outlet,but results shows a air-circulation from top to bottom and bottom to topin the cavity,no suction in the inlet. i still have some problems to set the boundary conditons: 1.i need to set a heatflux on external glazing to simulate solar radiation, but the wallheatflux utility seems doesn't work here,error accurs . 2.how could i set other boundary like pd and p in such natural convection case? now for p,it is zeroGradient for both inlet and outlet,for pd,it is fixedFluxbuoyantPressure. final results like this,there seems a convergency problem on pd. Time=545 ux,initial residual=xxxe-5,final residual=xxxe-6,no inerations 2; uy,initial residual=xxxe-5,final residual=xxxe-6,no inerations 2; uz,initial residual=xxxe-5,final residual=xxxe-6,no inerations 1; h,initial residual=xxxe-5,final residual=xxxe-6,no inerations 0; G,initial residual=xxxe-6,final residual=xxxe-6,no inerations 0; pd,initial residual=xxxe-5,final residual=xxxe-7,no inerations 113; epsilon,initial residual=xxxe-5,final residual=xxxe-6,no inerations 2; .... i don't know how to push it forward now, any help would be appreciated.

 December 20, 2010, 05:50 #2 New Member   yanjing Join Date: Dec 2010 Posts: 5 Rep Power: 8 i define one of boudary conditions by wallHeatFlux like this: extGlaz { type wallHeatFlux; heatFlux uniform 312.0; } .... but when i run it,error note as followed: can't find "value"entry on patch extGlaz of field T in file".....",which is required to set the values of the generic patch field.(actual tyep wallHeatFlux" please add the "value' entry to the write function of user-defined boudary-condition or link the boudary-condition into libfomaUtil.so can anyone tell me,what is the problem?

 Tags dsf pd heatflux

 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 aeroman FLUENT 4 July 1, 2015 06:09 AirS OpenFOAM 0 January 12, 2010 08:08 henj FLUENT 0 January 11, 2010 08:17 mgolbs OpenFOAM Pre-Processing 0 January 8, 2010 06:20 Anders Larsson Main CFD Forum 3 April 19, 1999 09:28

All times are GMT -4. The time now is 23:01.

 Contact Us - CFD Online - Privacy Statement - Top