memory requirements
 

Hi all,

In CFX4.4 I get the following error (in the output file):

INSUFFICIENT SPACE ON MACHINE TO ALLOCATE MEMORY CFX-4 STOPPED

Is this error related to ram or hard drive space? I know that I'm pushing the limit of the amount of physical memory required but I'm also wondering whether I'm running out of hard disk space.

With the -dir option: => -dir /model/.cfx4_tmpdir

Does anyone know how much hard drive space is required as compared to the amount of physical memory?

eg, for a 1GB ram model, how much space does CFX-4 need for its temporary directory?

cheers, Novak.

Re: memory requirements
 

Hi Novak,

The first question is; what is the grid size? Your RAM seems OK for a 'general' simulation.

There are 3 accations that I have seen this message: (1) When, in the postprocess, i become over ambitious and select many blocks/planes for vector plot, fringe plot etc (2) when i model a 2-phase 3D system on less than 0.6GB RAM machine. (3) When there is an interruption in the license acquisition (I call this false alarm!!).

regards Nyatoto

Re: memory requirements
 

Hi Nyatoto,

I have around 450000 internal cells, my solution was not grid independent with half that number of cells so I continue to refine the grid.

My model is a single phase, laminar transient flow problem with moving and deforming grids and an adaptive mesh (user fortran).

I'm not running the CFX-LINEGRAPH to dynamically plot the residuals since this program (line.exe) uses up as much memory as the solver (runsolve4)!

The problem is only in the solver, pre-processing doesn't present a problem and I haven't got a solution to post-process yet with this grid. There are no problems with the licencing.

Any thoughts? I guess I'll know the answer as soon as I can get my hands on a machine with more memory!

Novak.

Re: memory requirements
 

Then it appears the problem could just be the memory.

regards Nyatoto