# swirl inlet velocity for a 2-d axisymmetric flow

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

 January 10, 2015, 06:41 swirl inlet velocity for a 2-d axisymmetric flow #1 New Member   zahra rashidi Join Date: Dec 2014 Posts: 9 Rep Power: 10 hi every body, I have used blockmesh to create a wedge type mesh for an axisymmetric vortextube . i want to do an axisymmetric simulation with a swirl flow at the inlet,and i have some questions: 1-as u khow the equations will be different with the cartesian coordinate because of existence of swirl,does the code change them into correct one or i shuld change them myself?! 2-if i want to use "swirlFlowRateInletVelocity"in oF derived b.c, it just enter a swirl mass flow normal to boundary!but in my case the flow have both tangentional and radial velocity too,it means the swirl is not normal to boundary ,how can i intruduce the swirl flow that have radial velocity too as a B.C at inlet?! the B.C of my case( 2-d axisymmetric) in inlet is: { mass flow rate:0.2184 kg/s tngentional velocity:200 m/s radial velocity:90 m/s} I appreciate all your views and answers to these

 January 11, 2015, 02:02 #2 New Member   zahra rashidi Join Date: Dec 2014 Posts: 9 Rep Power: 10 no body can't help me? please speak about your idea.

 January 12, 2015, 07:01 #3 Senior Member   Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,265 Blog Entries: 1 Rep Power: 23 Dear Zahra 1-could you please define your question much precisely, equations are written and solved in Cartesian coordinate, what changes do you want to apply to them? 2- if you have the value of vector velocity , why dont you apply velocity vector directly at inlet like that: Code: ```type fixedValue; value uniform (Ux,Uy,Uz);``` and find appropriate Ux, Uy and Uz based on normal and tangential velocity __________________ Telegram channel (https://telegram.me/openfoam4Iranian) My Weblog in Persian(http://openfoam.blogfa.com/) My Personal Website (http://nimasamkhaniani.ir/)