# How to deifmne head loss co effcint ?

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

 February 5, 2006, 10:53 How to deifmne head loss co effcint ? #1 Angelina Guest   Posts: n/a What is approach velocity and device velocity.I have faced this problem during defing blcoakeg.Also I have a few problems when defining blockages. First is in my case I have to define a blcoakge in a zone.In that blcokage there is 40 percent area is open.Actually there is some tubes at taht place ,but instead modelling them i have taken blckage because i know the pressure drop taking from those tubes.Now for that i have to define that 40 percent area is open.Soi how i can define it in fluent?second thing is how to define head loss co effcient for that? i have gone through manual in that ther are loss co eff like resistance loss co eff,diractional loss co eff etc etc.so is ther any relation of head loss with these co eff? and what is permeabilty here?Pls answer this ifanybody know. Thanks all of u in advance.

 February 8, 2006, 10:41 Re: How to deifmne head loss co effcint ? #2 edi Guest   Posts: n/a Supposed that you defined your "blockage" zone as porous media, you can set for example porosity = 0.4 (40% open volume...). You can also choose between superficial and physical velocity formulation, useful if you're treating heat transfer or unsteady flows. The pressure drop equation used in Fluent is the classic Darcy+inertial term so, once you have the head loss, just calculate your coefficients...according to the direction you want (for example, if you want the fluid to flow only in 1 direction, you can put really big coefficients of pressure drop in the other directions (say 1e10)... Hope this can help. Edi.

 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 Madhukar FLUENT 2 June 23, 2014 05:04 jrg Main CFD Forum 1 November 19, 2007 14:09 Matthew Rosoff FLUENT 1 June 19, 2007 10:14 Angelina CFX 4 February 7, 2006 14:14 faisal FLUENT 0 April 23, 2001 04:13

All times are GMT -4. The time now is 23:08.