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arxiv: 2502.03916 · v2 · submitted 2025-02-06 · 💻 cs.CL · cs.AI

Experiments with Large Language Models on Retrieval-Augmented Generation for Closed-Source Simulation Software

Pith reviewed 2026-05-23 04:26 UTC · model grok-4.3

classification 💻 cs.CL cs.AI
keywords retrieval-augmented generationlarge language modelsclosed-source softwaresimulation softwarelocal LLMsinformation retrievalPasimodo
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The pith

Tailoring retrieved information to specific prompts significantly improves LLM performance on closed-source simulation tasks.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper tests retrieval-augmented generation with local large language models to support tasks in the closed-source mesh-free simulation software Pasimodo. Tasks include smart autocomplete, question answering, model summarization, component explanation, and creation of simulation components or input models. The systems deliver impressive results on many prompts but frequently fail when the retrieved information proves insufficient for the query. Making the supplied information dependent on the particular prompt yields a clear improvement in response quality while keeping all processing local to protect intellectual property.

Core claim

RAG systems using local LLMs for Pasimodo produce strong results across a range of tasks but often fail due to insufficient information; tailoring the information provided to the LLMs dependent on the prompts proves to be a significant improvement.

What carries the argument

Retrieval-augmented generation with prompt-dependent selection of information for local LLMs.

If this is right

  • Local LLMs can handle tasks from autocomplete to full model creation without sending data outside the institution.
  • Failures stem mainly from gaps in the retrieved context rather than inherent model limits.
  • Prompt-specific tailoring of context offers a practical route to higher response quality.
  • Smaller language models become viable for these tasks when retrieval is adjusted to the prompt.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same tailoring approach could be applied to other proprietary engineering tools that rely on internal documentation.
  • Further gains might come from analyzing the prompt first to decide which retrieval method to use.
  • Integration into simulation workflows could reduce the time engineers spend searching documentation.

Load-bearing premise

The tasks, prompts, and documentation structure of Pasimodo are representative enough of other closed-source simulation frameworks for the observed failure modes and improvements to generalize.

What would settle it

Testing the same prompt-dependent RAG approach on a different closed-source simulation framework with its own documentation and checking whether the quality gains persist.

read the original abstract

Large Language Models (LLMs) are tools that have become indispensable in development and programming. However, they suffer from hallucinations, especially when dealing with unknown knowledge. This is particularly the case when LLMs are to be used to support closed-source software applications. Retrieval-Augmented Generation (RAG) offers an approach to use additional knowledge alongside the pre-trained knowledge of the LLM to respond to user prompts. Possible tasks range from a smart-autocomplete, text extraction for question answering, model summarization, component explaining, compositional reasoning, to creation of simulation components and complete input models. This work tests existing RAG systems for closed-source simulation frameworks, in our case the mesh-free simulation software Pasimodo. Since data protection and intellectual property rights are particularly important for problems solved with closed-source software, the tests focus on execution using local LLMs. In order to enable smaller institutions to use the systems, smaller language models will be tested first. The systems show impressive results, but often fail due to insufficient information. Different approaches for improving response quality are tested. In particular, tailoring the information provided to the LLMs dependent to the prompts proves to be a significant improvement. This demonstrates the great potential and the further work needed to improve information retrieval for closed-source simulation models.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript reports experiments applying local LLMs with Retrieval-Augmented Generation (RAG) to tasks such as component explanation, compositional reasoning, and creation of simulation components and input models for the closed-source mesh-free simulation software Pasimodo. It observes that standard RAG frequently fails due to insufficient retrieved information and claims that tailoring the retrieved context to the specific user prompt yields a significant improvement in response quality, while emphasizing the use of local models to address data-protection concerns.

Significance. If the tailoring approach can be shown to produce measurable gains that hold across multiple frameworks, the work could offer a practical route for LLM-assisted development of proprietary simulation software. The focus on local execution and smaller models is a constructive choice for IP-sensitive settings. At present the evidence consists of qualitative impressions only, so the magnitude and reliability of the reported improvement remain unquantified.

major comments (3)
  1. [Abstract / Results] Abstract and Results section: the statements that the systems 'show impressive results' and that prompt-dependent tailoring 'proves to be a significant improvement' rest entirely on unquantified qualitative impressions; no accuracy, success rate, error-rate, or inter-rater metrics are reported for any of the tested RAG variants or tasks.
  2. [Experimental Setup] Experimental Setup (implied in Abstract and Scope): the manuscript provides no information on retrieval-corpus size, the exact test prompts employed, the concrete LLM versions tested, or the rubric used to judge response quality, rendering the central observations non-reproducible and preventing assessment of whether the observed failures are due to retrieval or to other factors.
  3. [Conclusion / Scope] Conclusion and Scope: the paper frames its findings as relevant to 'closed-source simulation frameworks' in general, yet all experiments are performed on a single mesh-free code (Pasimodo) without any argument or cross-framework test establishing that its documentation style or data layout is representative; this makes the claimed generality of the tailoring benefit an untested extrapolation.
minor comments (2)
  1. [Abstract] Abstract: 'dependent to the prompts' is grammatically incorrect and should read 'dependent on the prompts'.
  2. [Results] The manuscript would benefit from an explicit list of the tasks, the number of prompts per task, and a table summarizing the qualitative outcomes for each RAG configuration.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive comments, which correctly identify the reliance on qualitative assessment and the need for greater detail and caution in scope. We address each major comment below and will revise the manuscript to strengthen these aspects.

read point-by-point responses
  1. Referee: [Abstract / Results] Abstract and Results section: the statements that the systems 'show impressive results' and that prompt-dependent tailoring 'proves to be a significant improvement' rest entirely on unquantified qualitative impressions; no accuracy, success rate, error-rate, or inter-rater metrics are reported for any of the tested RAG variants or tasks.

    Authors: We agree that the current claims rest on qualitative impressions. In the revision we will add quantitative evaluation: success rates for each task and RAG variant, obtained via independent rating by two authors using a predefined rubric, together with inter-rater agreement statistics. revision: yes

  2. Referee: [Experimental Setup] Experimental Setup (implied in Abstract and Scope): the manuscript provides no information on retrieval-corpus size, the exact test prompts employed, the concrete LLM versions tested, or the rubric used to judge response quality, rendering the central observations non-reproducible and preventing assessment of whether the observed failures are due to retrieval or to other factors.

    Authors: We will add a dedicated Experimental Setup subsection that reports the retrieval-corpus size, the full list of test prompts, the precise LLM versions and inference parameters, and the complete evaluation rubric (accuracy, completeness, relevance, and hallucination criteria). revision: yes

  3. Referee: [Conclusion / Scope] Conclusion and Scope: the paper frames its findings as relevant to 'closed-source simulation frameworks' in general, yet all experiments are performed on a single mesh-free code (Pasimodo) without any argument or cross-framework test establishing that its documentation style or data layout is representative; this makes the claimed generality of the tailoring benefit an untested extrapolation.

    Authors: The experiments are confined to Pasimodo. We will revise the conclusion and abstract to state that the observed benefit of prompt-dependent tailoring is demonstrated for this framework and to present cross-framework validation as necessary future work rather than an established general result. revision: partial

Circularity Check

0 steps flagged

No circularity: purely experimental evaluation with no derivations or self-referential claims

full rationale

The paper conducts empirical tests of RAG systems on Pasimodo documentation and prompts, reporting observed failures and improvements from prompt-dependent tailoring. No equations, fitted parameters, uniqueness theorems, or self-citations appear as load-bearing elements in any derivation chain. All claims rest on direct experimental outcomes rather than reducing to inputs by construction, satisfying the self-contained experimental criterion for score 0.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The paper is an empirical feasibility study and introduces no new theoretical constructs, fitted parameters, or postulated entities.

pith-pipeline@v0.9.0 · 5753 in / 1000 out tokens · 31971 ms · 2026-05-23T04:26:29.899183+00:00 · methodology

discussion (0)

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