I think that >30

The value y+ is needed for turbulent simulations. Yours is a porous medium which is different, and you also state that the flow is laminar. Unless you have missed out some important information, it seems to me that you don't need y+.

https://www.sciencedirect.com/search?qs=modelling%20flow%20through%20porous%20media&show=25&sortBy=relevance

Dear Mr Akram,

The three documents which you have posted don't consider turbulent flow, but are on other topics. What is *your* opinion on the question?

Dear Mr. Parag,

I can also vouch for Prof. Rees that Y+ is a prerequisite only for turbulent flows.

Thanks,

Cheers & Regards,

Sivakumar Subramanian

Dear Mr.Parag C,

Y+ is only needed for turbulent flows. However as yours is a laminar flow problem you need not worry about it.

Thanks.

Saurav