# CFD Simulation API

*/Software/CFD_Simulation_API*

## Solution Overview

The CFD Simulation API ingests 3D geometry payloads in STEP or STL formats alongside physical boundary conditions via REST endpoints to execute fluid dynamics calculations. It runs headless Navier-Stokes and turbulence solvers on scalable cloud GPU infrastructure, returning pressure, velocity, and thermal data matrices as JSON and VTK files. The system translates static mechanical designs into quantifiable fluid behavior metrics without requiring a local computational environment.

Autonomous engineering agents and web-based generative design platforms integrate this API to rapidly evaluate iterative part variations. Drone manufacturers and HVAC system designers use the endpoints to score the aerodynamic drag or thermal efficiency of thousands of generated permutations. By abstracting the meshing and solving process into a programmatic layer, the API removes the need to manually configure simulation parameters in GUI-heavy desktop environments.

Operating as a headless SaaS primitive, the system sits between raw cloud compute clusters and upstream AI design agents. It handles the dynamic provisioning of high-performance computing instances below while serving structured aerodynamic scoring data to optimization algorithms above. Because aerospace and thermal simulations demand strict convergence validation, the API incorporates a human-in-the-loop checkpoint, requiring a lead engineer to review mesh quality and residual plots before downstream agents finalize high-stakes geometric adjustments.

## Headless Saas Data Model

**Entities**:
- Name: Simulation · Description: Core execution of fluid dynamics calculations on cloud GPU infrastructure
- Name: Geometry · Description: 3D part payload in STEP or STL format ingested for meshing
- Name: BoundaryCondition · Description: Physical constraints applied to the simulation geometry
- Name: ConvergenceReview · Description: Human-in-the-loop checkpoint validating mesh quality and residual plots
- Name: SimulationResult · Description: Returned output containing velocity vectors, thermal data, and aerodynamic scores
- Name: Workspace · Description: Tenant boundary defining compute cluster provisioning quotas and data access
**Relations**:
- To: Simulation · From: Workspace · Label: owns · Cardinality: one-to-many
- To: Geometry · From: Simulation · Label: processes · Cardinality: one-to-many
- To: BoundaryCondition · From: Simulation · Label: applies · Cardinality: one-to-many
- To: ConvergenceReview · From: Simulation · Label: requires · Cardinality: one-to-one
- To: SimulationResult · From: Simulation · Label: produces · Cardinality: one-to-one
**Tenant Anchor**: Workspace
**Primary Resource**: Simulation

## Api Definition

**Protocols**:
- REST
- SDK
- MCP
- Webhooks
**Consumed By**:
- [Generative Design Agent](/Agents/Generative_Design_Agent)
- [Aerodynamic Optimization Agent](/Agents/Aerodynamic_Optimization_Agent)
- [Thermal Routing Agent](/Agents/Thermal_Routing_Agent)
**Integrations**:
- [Amazon S3](/Products/Amazon_S3)
- [AWS Batch](/Products/AWS_Batch)
- [NVIDIA CUDA](/Products/NVIDIA_CUDA)
- [SolidWorks](/Products/SolidWorks)
**Consumption Model**: An agent registers the MCP server, posts geometric payloads via the Run Geometric Evaluation tool, and awaits the simulation.completed webhook to retrieve the aerodynamic metrics.
**Workflow Wrappers**:
- Name: Run Geometric Evaluation · Wraps: ingests STEP payloads, generates the mesh, applies boundary constraints, and executes the solver
- Name: Process Convergence Review · Wraps: pauses execution, exposes residual plots for human validation, and resumes the final computation

## Api Function Cascade

**Ai Role**: As a stateless SaaS primitive, the API executes geometric meshing, boundary configuration, and fluid dynamics solver calculations straight-through via deterministic code, pausing only to expose residual plots for human validation on exception.
**Cascade**:
- Kind: Code · Note: Retrieves the geometric payload from Amazon S3 or SolidWorks integration. · Step: Ingest STEP Payload · Verb: ingest · Realizes: Load CAD Geometry · Oversight: none
- Kind: Code · Note: Transforms the STEP file into a valid boundary volume mesh. · Step: Generate Volumetric Mesh · Verb: generate · Realizes: Generate Computational Mesh · Oversight: none
- Kind: Code · Step: Apply Boundary Constraints · Verb: configure · Realizes: Configure Simulation Parameters · Oversight: none
- Kind: Code · Note: Offloads complex matrix calculations to AWS Batch and NVIDIA CUDA. · Step: Execute Fluid Solver · Verb: compute · Realizes: Execute Fluid Dynamics Simulation · Oversight: none
- Kind: Code · Note: Pauses computation and exposes residual plots for human review if thresholds flag. · Step: Validate Residual Convergence · Verb: validate · Realizes: Validate Solver Convergence · Oversight: review-on-exception
- Kind: Code · Note: Pushes the final aerodynamic metrics to the consuming generative agent. · Step: Emit Completion Webhook · Verb: dispatch · Realizes: Dispatch Simulation Metrics · Oversight: none
**Optimizes**:
- [Simulation Turnaround Time](/Metrics/Simulation_Turnaround_Time)
- [Solver Convergence Rate](/Metrics/Solver_Convergence_Rate)
- [Compute Resource Utilization](/Metrics/Compute_Resource_Utilization)
- [Mesh Generation Time](/Metrics/Mesh_Generation_Time)

## Headless Saas Representative Offer

**Warranty**: Maintains a 99.9% API uptime guarantee, offering automatic compute-credit refunds for simulation jobs that fail due to infrastructure faults or orchestration timeouts.
**Price Band**: ~$0.10 to $5.00 per simulation run, metered dynamically based on mesh cell count and GPU-hours consumed during solver execution
**Pricing Kind**: UsageMeter
**Deliverables**:
- Volumetric mesh structures
- Extracted aerodynamic and thermal metrics
- Raw scalar and vector flow field datasets
- Solver convergence logs and residual plots
**Delivery Mode**: The API is self-serve and instantly provisioned, allowing agents to attach the MCP server, submit geometric payloads, and consume compute capacity automatically.
**Business Function**: ProvideService
**Agent Checkout Support**:
- agentic-commerce-protocol
- stored-credential

## Headless Saas Crud Surface

**Auth Model**: API Key
**Endpoints**:
- GET /simulations — list simulations
- POST /simulations — create a new simulation
- GET /simulations/{id} — fetch a simulation
- PATCH /simulations/{id} — update simulation status or solver type
- POST /simulations/{id}/run — execute fluid dynamics calculations
- GET /simulations/{simulationId}/geometries — list geometries for a simulation
- POST /simulations/{simulationId}/geometries — ingest a 3D part payload
- GET /simulations/{simulationId}/geometries/{id} — fetch a geometry
- PATCH /simulations/{simulationId}/geometries/{id} — update geometry format or mesh resolution
- GET /simulations/{simulationId}/boundary-conditions — list boundary conditions
- POST /simulations/{simulationId}/boundary-conditions — create a boundary condition
- GET /simulations/{simulationId}/boundary-conditions/{id} — fetch a boundary condition
- PATCH /simulations/{simulationId}/boundary-conditions/{id} — update physical constraints
- GET /simulations/{simulationId}/convergence-reviews — list convergence reviews
- POST /simulations/{simulationId}/convergence-reviews — create a convergence review checkpoint
- GET /simulations/{simulationId}/convergence-reviews/{id} — fetch a convergence review
- PATCH /simulations/{simulationId}/convergence-reviews/{id} — update mesh quality score
- POST /simulations/{simulationId}/convergence-reviews/{id}/approve — approve mesh and residual plots
- GET /simulations/{simulationId}/simulation-results — list simulation results
- POST /simulations/{simulationId}/simulation-results — record simulation output
- GET /simulations/{simulationId}/simulation-results/{id} — fetch a simulation result
- PATCH /simulations/{simulationId}/simulation-results/{id} — update aerodynamic metrics
- GET /workspaces — list workspaces
- POST /workspaces — create a workspace
- GET /workspaces/{id} — fetch a workspace
- PATCH /workspaces/{id} — update workspace compute quota
**Multitenancy**: Row-level isolation
**Webhook Events**:
- simulation.started
- simulation.completed
- simulation.failed
- convergence_review.required
- convergence_review.approved

## Headless Saas Erd

```mermaid
erDiagram
  Workspace {
    UUID id PK "tenant key"
    VARCHAR name
    DECIMAL computeQuota
    BOOLEAN isActive
  }
  Simulation {
    UUID id PK
    UUID workspaceId FK
    VARCHAR status
    VARCHAR solverType
    TIMESTAMP createdAt
  }
  Geometry {
    UUID id PK
    UUID simulationId FK
    VARCHAR format
    VARCHAR fileUrl
    DECIMAL meshResolution
  }
  BoundaryCondition {
    UUID id PK
    UUID simulationId FK
    VARCHAR conditionType
    JSONB physicalParameters
  }
  ConvergenceReview {
    UUID id PK
    UUID simulationId FK
    VARCHAR status
    VARCHAR residualPlotsUrl
    DECIMAL meshQualityScore
  }
  SimulationResult {
    UUID id PK
    UUID simulationId FK
    VARCHAR vtkDataUrl
    JSONB aerodynamicMetrics
    TIMESTAMP completedAt
  }
  Workspace ||--o{ Simulation : owns
  Simulation ||--o{ Geometry : processes
  Simulation ||--o{ BoundaryCondition : applies
  Simulation ||--|| ConvergenceReview : requires
  Simulation ||--|| SimulationResult : produces
```

## Neighborhood

### Composed into

- [Aband](/Startups/Aband) — composes · Startups

### What it uses

- [Dassault Systemes SolidWorks](/Products/Dassault_Systemes_SolidWorks) — uses · Products
- [Amazon S3](/Software/Amazon_S3) — uses · Software
- [AWS Batch](/Products/AWS_Batch) — uses · Products
- [NVIDIA CUDA](/Products/NVIDIA_CUDA) — uses · Products

### Optimizes

- [Solver Convergence Rate](/Metrics/Solver_Convergence_Rate) — optimizes · Metrics
- [Compute Resource Utilization](/Metrics/Compute_Resource_Utilization) — optimizes · Metrics
- [Mesh Generation Time](/Metrics/Mesh_Generation_Time) — optimizes · Metrics
- [Simulation Turnaround Time](/Metrics/Simulation_Turnaround_Time) — optimizes · Metrics

### Who consumes this

- [Aerodynamic Optimization Agent](/Agents/Aerodynamic_Optimization_Agent) — consumed by · Agents
- [Generative Design Agent](/Agents/Generative_Design_Agent) — consumed by · Agents
- [Thermal Routing Agent](/Agents/Thermal_Routing_Agent) — consumed by · Agents

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