Co-Simulation Engineer III

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Co-Simulation Engineer III based in the United States.

We are seeking an experienced engineering professional to develop advanced co-simulation models and digital twin capabilities for hyperscale data centers and complex cooling infrastructure. In this role, you will combine thermo-hydraulic modeling, computational fluid dynamics (CFD), and multi-domain simulation to support the design and optimization of mission-critical environments. You will work closely with engineering, design, commissioning, and project management teams to deliver accurate models and actionable technical recommendations. Your work will cover chilled water and liquid cooling systems, transient operating conditions, system performance, and validation against real-world data. You will also contribute to reusable modeling assets, technical standards, and innovative digital workflows. This fully remote opportunity offers the chance to work on technically challenging projects while helping shape the next generation of data center engineering.

Accountabilities

You will independently manage complex modeling assignments, collaborating with multidisciplinary teams to develop, integrate, validate, and document co-simulation solutions. Your responsibilities will include:

• Coordinate with design teams to define co-simulation objectives, performance metrics, acceptance criteria, modeling prerequisites, and required project data.

• Establish simulation assumptions, initial conditions, coupling strategies, and model boundaries across 1D hydraulic networks, 3D CFD models, and control systems.

• Independently develop thermo-hydraulic flow-network models for chilled water and liquid cooling systems, including pumps, valves, heat exchangers, coolant distribution units (CDUs), manifolds, and cold plates.

• Build and maintain system-level models for steady-state and transient performance, including redundancy scenarios, failure modes, and control logic impacts.

• Develop co-simulation interfaces between 1D network models and 3D CFD or thermal models, managing data exchange, time steps, and convergence.

• Perform pressure-drop, flow-balancing, and heat-rejection analyses to validate design intent and support equipment selection and sizing.

• Use hydraulic modeling tools such as Flownex, Siemens Flomaster, Aspen HYSYS, or equivalent platforms, alongside CFD tools such as Cadence Reality DC Design, ANSYS Fluent, or Siemens STAR-CCM+.

• Create and maintain simulation-ready system schematics, component libraries, and metadata to support reusable modeling assets and digital twin workflows.

• Configure and review model setups, including boundary conditions, solver settings, co-simulation time steps, and quality checks.

• Prepare detailed technical reports documenting modeling assumptions, methodologies, results, limitations, and actionable design recommendations.

• Contribute to proposals by defining modeling scope, schedules, and budgets, and present technical findings and recommendations to clients and internal stakeholders.

• Manage modeling deliverables, resource forecasts, project coordination, model version control, scripts, and documentation.

• Perform quality assurance and quality control (QA/QC) peer reviews of co-simulation models when not serving as the lead analyst.

• Validate and calibrate simulation results using analytical methods and real-world operating data to ensure models are accurate and fit for purpose.

• Collaborate with design, commissioning, operations, and CFD teams to collect and reconcile site data, including BMS/SCADA information and flow, temperature, and pressure measurements.

• Prepare validation and calibration reports comparing model predictions with measured data, documenting uncertainty, limitations, and performance envelopes.

• Review technical queries concerning modeling assumptions, simulation results, and design implications, and approve model updates based on validation findings and project changes.

• Maintain validation checklists, modeling standards, project progress reports, issue logs, model status updates, assumptions logs, revision histories, and applicable RFI responses.

• Track personal project hours and ensure assigned deliverables are completed on time and within budget.

• Use AI-enabled and digital tools to improve efficiency, reduce manual work, and support consistent, high-quality engineering outputs.

• Identify opportunities for process improvement, adopt emerging technologies, and contribute to continuous learning and innovation across engineering workflows.

• Perform other related duties as assigned.

Requirements

The ideal candidate combines strong mechanical engineering fundamentals with practical experience in hydraulic modeling, CFD, and complex engineering consultancy projects. The following qualifications and capabilities are expected:

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