I was running a flow simulation for my snior project ( Designing of a hypersonic windtunnel) and one of the parts of the desgin is the pebble bed heater which is the most difficult part in the design.

I tried to run flow simulation but I ran out of memory as the case is complicated and has too much details and parts I guess.

the pebbles amount about 5000 pcs inside the heater.

I'm willing to upgrade my memory to 16GB and I wish it would be suffeicient for this simulation but I have some concern about the timing.

my current RAM is one slot of 8GB XMS Memory kit for dual channel systems, 1600MHz.

My question is do is it better to get a new set of RAM 2X8GB with higher frequency or should I just get another 8GB slot to run this simulation.

how much the software rely on the RAM during this simulation.