Make sure that you consider this. (EDIT: I did see that you did consider that 2x multiplier (perhaps @ROHIT_SR forgot to multiply his output 
) , I was just trying to make sure that people who use this topic for future reference will not miss it )
And then you need to confirm that you actually achieved the y+ which you seek, by viewing a y+ surface map.
BUT, remember that a y+ surface mapping is most valid on results from a converged Sim Run WITH stable results values.
I look for forces to be stable to less than 1% range over the last 500 iterations. Range is WRT each forces average value over the last 500 iterations, or the end value at the last iteration that they appear to be converging to. I have proposed a new way to specify results stability with an ORSI value which you can have a look at here.
More accurately than visually guessing at an average achieved y+ mapping value in SimScale Post Processor, you can download the results of your Sim Run and fairly easily have ParaView give you an average y+ value OR with a little more effort you can use my yPlusHistogram program on a csv exported from ParaView for a detailed analysis of your y+ surface mapping.
@Kai_himself , since that is your 1st try at y+, CONGRATULATIONS, well researched, as I believe everything that you did correctly, likely did not come from one source, did it? … 