From wallpaper to wood paneling, there are countless options to choose from. A plain white wall can be turned into a stunning focal point with the right treatment. But ideally, you should aim for a y+ value of 1-2.Wall treatments can completely transform a room. When placing the first cell center, you can go as high as six without losing too much accuracy. It is a common agreement that the upper limit of the viscous sublayer is five. Pushing the mesh to values of y+ below 0.1 can result in low-quality meshes for industrial applications. Values of y+ lower than 0.1 will not give a large improvement. When using the wall resolving approach, try to get an average y+ value close to 1 or lower. However, when it comes to having a flow with separation or heat transfer problems, it is better to resolve the mesh as it is a more accurate approach. One can see the wall modelling approach using wall functions is a better option as it requires less computational resources.
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