# how to set swirl number in ansys

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 July 15, 2013, 19:42 how to set swirl number in ansys #1 New Member   tamershahinreda Join Date: Jul 2013 Posts: 4 Rep Power: 4 hello.. i want to simulate combustor chamber with air and fuel mass flow rate 1 litre and 0.5 litre respectively and axial velocity 0.5 m/s and swirl number - 0.066. but i dont know how and where i can insert the value of swirl number in the boundary condition.... if have any idea about this case help me please thanx ,,,,,

 July 15, 2013, 20:25 #2 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 12 Find the definition of swirl number and calculate the tangential velocity yourself. tamershahinreda likes this.

 July 15, 2013, 23:22 #3 Super Moderator     Ghazlani M. Ali Join Date: May 2011 Location: Canada Posts: 1,291 Blog Entries: 23 Rep Power: 20 some fluent tutorials are available ! where swirl number is used. do more research i'm sure the web is full of them tamershahinreda likes this. __________________ Regards, New to ICEM CFD, try this document --> http://goo.gl/G2gkE Ali

 July 16, 2013, 19:59 #4 New Member   tamershahinreda Join Date: Jul 2013 Posts: 4 Rep Power: 4 ghazlani iam not asking about meshing please iam asking about "'SWIRL NUMBER INSERTING IN ANSYS'" if you can give me some tutorial about it i will be very thanx regards

 July 16, 2013, 20:57 #5 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 12 That is part of his signature rather than response. As I said before, you need to decide what kind of vortex could be representative for you inlet. Then you can calculate the parameters according to the swirl number. You can search with the term "Batchelor vortex" for an example. However as I recalled the axial velocity is not be uniform so that the mass flux rather than the axial velocity distribution will be guaranteed. tamershahinreda likes this.

 July 16, 2013, 21:29 #6 New Member   tamershahinreda Join Date: Jul 2013 Posts: 4 Rep Power: 4 thank you black smak let us suggest situations like (vortex) and suggest numbers and if we divide tangential velocity by axial and equal it with swirl number to find tangential velocity ..... please make numbers and let it very clear please it still very very vague.. Regards....

 July 16, 2013, 21:50 #7 Senior Member   Join Date: Aug 2011 Posts: 315 Rep Power: 12 Let the axial and tangential velocity of some axisymmetric vortex be U(r; a) and V(r; q), where a and q are the parameters to be determined. Then the mass flux MF = Integrate[U(r;a), {r, 0, R}] = f(a) and the swirl number SN=Weighted Integral of V(r;a) / Weighted Integral of U(r;a) = g(a, q) can be calculated. Then a and q can be determined for a given mass flux and swirl number so are the velocity profiles for you inlet boundary condition. tamershahinreda likes this.

 July 16, 2013, 23:36 #8 New Member   tamershahinreda Join Date: Jul 2013 Posts: 4 Rep Power: 4 To be honsety with you i can't understand you very well It seems that you have good idea about this (Inserting Swirl Number in Ansys) Many people want to know how to do it..........many questions .... Please if you can make an example...to explain how to put swirl number in ansys. help us please In the example clarify fuel and air inlet mass flow rate and swirl number and ... and ... you can assume it .... and step by step make the calculation and let us know how you can put the swirl number value in ansys pictures very usefull if you can upload it... thank you very

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