High-Memory HPC Node for CFD: 1 TB RAM for Large ANSYS Fluent Meshes

Most CFD engineers do not hit a speed wall first — they hit a memory wall. The mesh that finally resolves your boundary layer, your small geometric features, or your multiphase interface needs more RAM than any workstation has, so the case will not even initialize. You coarsen the mesh to make it fit, and the result you get is not the result you needed.

This HPC node is built to remove that wall. With 1 TB of RAM behind 12 Intel Xeon cores, it is a high-memory CFD compute node designed to load and run the large ANSYS Fluent cases that crush a desktop. If your simulation is limited by memory rather than by raw core count, this is the machine for it.

Specifications

The defining feature here is the memory-to-core ratio. A typical CFD workstation might pair a fast CPU with 64–128 GB of RAM. This node carries a full terabyte. That changes which simulations are possible, not just how fast they run.

Why 1 TB of RAM matters for CFD

In ANSYS Fluent, memory requirement scales with mesh size and with the number of equations solved per cell. As a rough guide, a typical steady, single-phase case needs on the order of 1 GB of RAM per million cells — and complex physics (multiphase, combustion, transient cases with extra transported scalars) pushes that higher.

With 1 TB available, this node can comfortably load meshes in the hundreds of millions of cells, depending on the physics involved. Put concretely, this is the difference between:

• A mesh that fails to initialize on a workstation because it runs out of memory, versus one that loads and runs.

• Being forced to coarsen the mesh to fit your hardware, versus resolving the physics at the fidelity your problem actually demands.

• Skipping a mesh-independence study because the fine mesh will not run, versus completing it properly.

For memory-bound CFD, capacity is capability. A simulation that does not fit cannot run at any speed — and this node is built so that it fits.

What this node is ideal for

This configuration is purpose-suited to memory-heavy simulations:

• Very large meshes — cases of tens to hundreds of millions of cells that exceed workstation memory.

• Multiphase flows — VOF, Eulerian multiphase, and dense particle models (DPM/DDPM), where extra phases and equations multiply per-cell memory.

• Transient simulations with many transported scalars — species transport, multiple UDS fields, and detailed sub-models that each add to the memory footprint.

• Conjugate heat transfer and thermal models — electronics cooling, data-center airflow, and other coupled fluid-solid domains with large combined meshes.

• Detailed geometry — full-scale models where you cannot afford to throw away small features.

• Cases that simply will not load locally — if your workstation runs out of memory before the solver even starts, this is the node that runs it.

The 12 Xeon cores (24 threads) handle the parallel solve, while the 1 TB of memory is what lets the case exist in the first place. If your bottleneck is "it won't fit," this configuration is built for you.

Fast SSD storage for heavy I/O

CFD is not only compute- and memory-intensive — it is I/O-intensive. Large case and data files, frequent autosaves, and transient runs that write data at many time steps all hammer the disk. The dual 960 GB SSDs give you fast read/write for exactly this: quicker case loads, faster data writes, and autosaves that do not stall your solver while a slow disk catches up. For transient simulations that dump large data files repeatedly, fast storage keeps the run moving.

How parallel solving works on this node

When you run Fluent in parallel, the solver partitions your mesh across the available processes (using algorithms such as METIS), so each core works only on its share of the cells. The processes exchange boundary data each iteration via MPI. On a single node like this one, that communication happens through fast shared memory rather than across a network — which keeps parallel overhead low.

The 12 cores / 24 threads give you solid parallel throughput for a single node, while the real headline remains the memory: this machine is sized so that the large case loads and runs, then uses every core to solve it. It is honest to say this node is optimized for capacity over raw core count — and for memory-bound CFD, that is exactly the right trade.

Renting this node vs. buying your own

A server with 1 TB of ECC RAM is expensive to buy, and it sits idle — still costing you — between projects. Renting matches your cost to your actual workload:

For most engineers, consultancies, and research teams who need serious memory only periodically, renting is simply the better economics.

How it works

1. Tell us about your case — mesh size, physics, and your deadline. We confirm this node fits your memory needs and advise on solver settings.

2. Upload your case files securely.

3. We run it on the node with ANSYS Fluent.

4. You receive your results — solution and data files, ready for post-processing.

Prefer to drive it yourself? You can run interactively. We adapt to how your team works.

Frequently asked questions

My case runs out of memory on my workstation. Will it run here? That is exactly what this node is for. With 1 TB of RAM, meshes that exhaust a 64–128 GB workstation generally load and run comfortably here. Send us your cell count and physics and we will confirm the fit.

How large a mesh can it handle? As a rough guide, count on roughly 1 GB of RAM per million cells for a typical steady single-phase case — so hundreds of millions of cells are realistic — with complex physics (multiphase, combustion, many transported scalars) needing more memory per cell and therefore supporting a somewhat smaller mesh. Tell us your case and we will give you a concrete estimate.

Is 12 cores enough? For memory-bound work, yes — the whole point of this node is that the case fits and runs, which a faster but lower-memory machine cannot achieve at all. The 12 cores / 24 threads then solve it in parallel. If your bottleneck is raw core scaling rather than memory, ask us about higher-core configurations.

Is my data kept confidential? yes

Run the case that won't fit on your desktop

If you have a simulation you keep coarsening just to make it load, stop compromising the mesh to fit your hardware. This node was built for the large, memory-hungry cases that workstations cannot hold.

Contact MR CFD to run your large ANSYS Fluent case on our 1 TB high-memory HPC node