Could anybody share some experiences of using high-order schemes? I found it is difficult to get convergent computation. I am simulating the wind flows around bluff bodies and there is no scalar transport and heat transfer involved. Could anybody shed the light of using high-order schemes with respect to which parameters should be taken care of? Thanks.

Detailed recommendations can be found in the PHOENICS Journal paper: Schemes for Convection Discretisation in PHOENICS by M.R.Malin & N.P.Waterson, PHOENICS Journal, Vol.12, No.2, July 1999 (ISSN 0969-8248).

Thank you, Mike. I've got the paper you mentioned in hand. I've tried QUICK, HQUICK, HCUS, UMIST, Van Leer 1, Van Leer 2, SMART, KOREN, CHARM, MINMOND schemes and I found the rate of convergence is quite slow and sometimes the convergence is not attainable. The QUICK scheme cannot yield a convergent solution in my case which is an investigation of airflow around a surface mounted cube. The others are fine. I used the CGGR solver and the value of SARAH was 1.0e-4. I also set ISOX=1. I just want to know if there are some 'tricks' or 'tips' that may be used to accelerate the rate of convergence when using these high-order schemes.

Cheers.