---
pretty_name: ExtFoamBench — CFD Tasks, Geometry Assets and Evaluation Metrics
language:
- en
license: other
license_name: easyfoam-benchmarks-component-licenses
license_link: LICENSE.md
size_categories:
- n<1K
tags:
- benchmark
- computational-fluid-dynamics
- openfoam
- scientific-computing
- agents
- physics
- evaluation
- reference-data
configs:
- config_name: extended
  default: true
  data_files:
  - split: test
    path: data/extended.jsonl
- config_name: basic
  data_files:
  - split: test
    path: data/basic.jsonl
- config_name: advanced
  data_files:
  - split: test
    path: data/advanced.jsonl
- config_name: all
  data_files:
  - split: test
    path:
    - data/extended.jsonl
    - data/basic.jsonl
    - data/advanced.jsonl
---

# ExtFoamBench

**English** | [中文介绍](README_zh.md)

**100 CFD tasks · 7 geometry assets · task-specific physical evaluation**

ExtFoamBench is a benchmark for evaluating OpenFOAM agents, introduced in [EasyFoam](https://openreview.net/forum?id=GhQ5YmhU8B). This repository focuses on **the ExtFoamBench dataset, the geometry assets needed by its tasks, and the evaluation metrics and acceptance criteria**.

## Core resources

| Resource | What it provides | Files |
| --- | --- | --- |
| **ExtFoamBench dataset** | 100 tasks across 10 families, covering operating conditions, mesh/geometry, physics, numerical settings and multi-run workflows | [Task table](data/extended.jsonl) · [Reference case inputs](benchmarks/extended_cases.json) |
| **Geometry assets** | 7 ready-to-use geometry files for stirred-reactor, airfoil and vehicle cases, with source attribution and checksums | [Assets](benchmarks/assets/) · [Manifest](benchmarks/assets/manifest.json) |
| **Evaluation metrics and criteria** | Execution, numerical and physical acceptance; per-task QoI definitions, measurement rules, reference comparisons and tolerances | [Measurement specs](benchmarks/extended_measurement_specs.json) · [QoI design](benchmarks/extended_qoi_design.json) · [Reference values and tolerances](benchmarks/extended_reference_qois.json) |

Each family has a baseline and nine variants: `yPlusVerification`, `risingBubble`, `supersonicCrossJet`, `nozzleCDV`, `MRF_stirredReactor`, `ERCOFTA_pump`, `compressibleBubbleCollapse`, `aerofoilNACA0012`, `drivaerFastback`, and `riemann2D`.

The tasks are developed by the EasyFoam authors. Geometry assets are redistributed from attributed OpenFOAM 13 sources; their original notices are retained.

## Evaluation

A task is assessed along three dimensions: **E** (execution completes), **N** (applicable numerical checks pass), and **Q** (all mandatory physical/QoI criteria pass).

- **ECR** = tasks passing E / all assigned tasks.
- **TAR** = tasks passing E, N and Q together / all assigned tasks.

QoI rules specify what to measure, spatial/time support, comparison methods and acceptance tolerances. Missing outputs remain in the denominator. Diagnostic or continuous scores do not override failed mandatory criteria.

## Use the dataset

Install `datasets`, then load the default Extended track:

```python
from datasets import load_dataset

tasks = load_dataset("Eurus132/ExtFoamBench", "extended", split="test", revision="v1.2.0")
print(len(tasks))  # 100
print(tasks[0]["usr_requirement"])
```

To download geometry, criteria and reference data as well:

```bash
hf download Eurus132/ExtFoamBench --repo-type dataset --revision v1.2.0 --local-dir ExtFoamBench
```

The task table contains requirements and metadata. Reference case inputs and reference answers are for evaluation; keep them outside the solving agent's accessible workspace. The `test` label denotes benchmark tasks, not the historical skill-evolution held-out split.

## Supporting resources

For broader comparison, the repository also includes **FoamBench Basic (110)** and **Advanced (16)** from [upstream FoamBench](https://github.com/NLR-Theseus/cfdllmbench). These are inherited tasks; the EasyFoam authors contribute their **evaluation criteria and offline reference data**. Select `basic`, `advanced`, or `all` (226 tasks) to browse them.

Offline QoI references and numerical summaries support evaluation across all three tracks. The [optional evaluation tools](tools/evaluation-tools.zip) bundle the scorer, scripts and schemas; extract them only when needed. The [guide](GUIDE.md) covers usage, data coverage and protocol details. The [EasyFoam Skill library](https://github.com/CAS-CLab/EasyFoam) is distributed separately.

## Citation and licenses

Cite [EasyFoam](https://openreview.net/forum?id=GhQ5YmhU8B) when using ExtFoamBench or its evaluation/reference resources, and credit [FoamBench](https://github.com/NLR-Theseus/cfdllmbench) when using Basic/Advanced. See [component licenses](LICENSE.md) for project and third-party terms.

Version **1.2.0** uses concise, consistent filenames across data, tools and documentation. Numerical reference values, acceptance rules and scoring logic are unchanged. Earlier releases remain available.