Hello, I want to ask how strict the range 1< Y+ <5 for Enhanced Wall treatment is, and what Fluent is computing if the Y+ Values differ from this range. Is a Y+ Value of 0,9 still ok. What about 0,25 or 0,5? Kind Regards Gerd Sattler

Hi Gerd,

Put simply, it depends on your application!

Alan

This question has been addressed by pUl| long back. Read this (4th comment)

http://university.fluent.com/blog/in...&pb=1#comments

Rajesh

Hello Rajesh, thanks for ur response. The comment u showed me is concerned with the Y+ Values for standard wall funktions, but I am working with enhanced wall treatment. So I am not sure in how far it can help me in solving my problem. I heard that fluent uses wall funktions if the Y+ value is too high, but what happens if it is too low for enhanced wall treatment? In my simulation the Y+ value is at the channel wall about 0,92 and at a bluff body just a few cells have a value of about 0,5. I guessed it is ok, cause the cells with those low Y+ values are near the walls and shouldned habe too much influence on the results of my simulation. Kind Regards Gerd

It is suggeted in the Fluent manual that, for the enhanced wall traetment one can use a Y plus value of ~1. So as you told, if you have y plus values of 0.92 and 0.5, I think it won't make problems in your results, provided you feel fine with the no. of meshes! (depending on the Reynolds number)

Rajesh

Thanks for ur help. I also guessed it should be ok. But its nice to see me confirmed. Kind Regards Gerd