Learning Forum

[Geo573]

Hello everyone, nI'm currently working on a complex geometry of a valve, and I'm trying to get the pressure drop between inlet/outlet in order to calculate the Kvs / Cv. nI've been using a Thetrahedron meshing, with 10 inflation layers, with first aspect ratio of 5, and a growth rate 1.2nIn fluent, I've used the K-eps model with Enhanced Wall Treatment, using second order upwind method. My material is liquid water and my boundary conditions are Wall, Velocity inlet ( with velocity magnitude 1.5 m/s, turbulent intensity of 5% and hydraulic diamter 0.05 for a DN50 valve), and Pressure Outlet (where reference pressure is 1atm and gauge pressure 0).nI initialize with a standard initialization computed from velocity inlet.nAs a result, I get y+ values going from 0.12 to 54 at the wall. If I'm correct, y+ should be around 1 with this model right ? nWould you have any suggestion to improve this ? nThank you !n

[Keyur Kanade]

For using k-e ewt, you will need to have refined mesh at walls to have y+ ~1. nFor this you will need to reduce first height of your inflation. Use last aspect ration method and give first height. nOr if you want to use first aspect ration method, then please use value of 10 to 20. nPlease go through help manual for more details nRegards,nKeyurnHow to access Ansys Online Help DocumentnHow to show full resolution imagenGuidelines on the Student CommunitynHow to use Google to search within Ansys Student Communityn

[Geo573]

Thank you for your answer, this is very helpful !nnCould you just indicate me how to calculate first height for a complexe geometry ?Thank you !n

[Keyur Kanade]

Please check nn