# Skin Friction co-efficient (Cf)

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

 May 22, 2013, 02:24 Skin Friction co-efficient (Cf) #1 New Member   Md. Join Date: Dec 2012 Posts: 5 Rep Power: 7 Hello all, I need to insert the value of skin friction co-efficient (Cf) into my design [left ventricle of the heart], but I don't know how to input it in ANSYS CFX 14.0. I need to know how to insert the value of Cf in the wall with NO SLIP boundary condition. Any help would be highly appreciated. Thanks!

 May 22, 2013, 05:54 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,214 Rep Power: 110 This will work back to a wall shear stress. So use the wall shear stress boundary and write a CEL expression from your Cf.

 May 22, 2013, 05:58 #3 New Member   Md. Join Date: Dec 2012 Posts: 5 Rep Power: 7 Thanks mate! Umm, did you mean WSS in post-processor? Could you please describe how should I do it? Cheers

 May 22, 2013, 07:22 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,214 Rep Power: 110 No, I mean use the "Specified Shear" option when you set the wall boundary condition. THen you can set the wall shear stress at that wall as a function of anything you like.

 May 23, 2013, 06:39 #5 New Member   Md. Join Date: Dec 2012 Posts: 5 Rep Power: 7 I have got the value of WSS from the equation of Cf, but while inserting it, I am bit confused how to put it here? I have 1 inlet and the rest of the structure is 'wall'. My structure is similar to the cylindrical-shape. Say I have got the value of WSS of 319.44 N/m2 and how should I put it in this case? WSS won't be same in everywhere of the LV of the heart?

 May 24, 2013, 06:14 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,214 Rep Power: 110 Yes, if you enter the WSS as 319 then it will be 319 everywhere. If you want it to vary then you need to make it a function of something which varies.

 May 27, 2013, 04:53 #7 New Member   Md. Join Date: Dec 2012 Posts: 5 Rep Power: 7 I'm still trying it out. Thank you so much!

 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 sutthinan Main CFD Forum 2 November 28, 2012 14:03 mosessitio FLUENT 0 May 21, 2011 03:21 mosessitio FLUENT 0 May 20, 2011 20:30 syler3321 FLUENT 2 March 24, 2011 09:05 Francois FLUENT 1 February 10, 2006 07:21

All times are GMT -4. The time now is 13:00.