CFD Consulting vs. In-House CFD: Which Is Right for Your Engineering Team?

Comparison of In-House vs Consulting CFD

Factor	In-House CFD	CFD Consulting	Forensim CFD
Upfront investment	High	Low	10-40% lower than industry average
CFD software investment	Company responsibility	Usually included	Included
Specialized CFD expertise	Must hire/develop	Available as needed	Available
Best for occasional projects	Often inefficient	Good	Excellent
Best for continuous CFD workload	Excellent	Good	Excellent; Flexible and cost-efficient
Specialized physics	Depends on internal team	Depends on consultant	CFD, thermal, multiphase, combustion, FSI & more
Scaling workload	More difficult	Easy	Easy & Flexible
Internal knowledge/control	High	Moderate	Collaborative approach with your engineers
Cost structure	Ongoing fixed costs	Project-based	Lean model designed to reduce consulting overhead
Speed to establish capability	Can take months	Fast	Start immediately

What Does In-House CFD Require?

Building a serious CFD capability involves considerably more than purchasing simulation software.

An organization may need to invest in:

• Experienced CFD engineers
• Commercial CFD software or supported open-source tools
• High-performance workstations or computing infrastructure
• Cloud or HPC resources
• Data storage
• Training
• Software maintenance
• Model verification and validation processes
• Continued development of engineering expertise

The largest investment is often engineering expertise.

CFD software can generate results, but producing reliable engineering conclusions requires understanding fluid mechanics, heat transfer, turbulence, numerical methods, meshing, boundary conditions, convergence, and the physics of the application.

When Does CFD Consulting Make More Sense?

Hiring a CFD consulting company is often attractive when simulation needs are intermittent, highly specialized, or project-specific.

For example, an organization may need CFD to investigate:

• An unexpected equipment failure
• HVAC performance
• Excessive pressure drop
• Overheating
• Poor flow distribution
• Multiphase behavior
• Combustion
• Flow-induced vibration
• A new product concept

Hiring a permanent CFD engineer and maintaining software and computing infrastructure for a handful of projects each year may not make financial sense.

A CFD consultant allows the organization to purchase the engineering capability when it is needed.

Access to Specialized Expertise

One important advantage of consulting is access to expertise that may not justify a permanent internal position.

CFD encompasses many specialized areas, including:

• Aerodynamics and hydrodynamics
• HVAC and ventilation
• Heat transfer
• Piping and turbomachinery
• Multiphase flow
• Combustion and reacting flows
• Fluid-Structure Interaction (FSI)
• Transient CFD
• Thermal-fluid analysis

An engineer experienced in HVAC airflow is not automatically an expert in combustion or multiphase flow.

For projects involving specialized physics, hiring a consultant with relevant experience may be more efficient than developing that capability internally for a single project.

What About Software and Computing Costs?

CFD can require significant computational resources.

Complex simulations may involve millions of computational cells and substantial CPU time, memory, and storage.

An internal team must maintain sufficient resources for peak workloads—or purchase additional cloud/HPC capacity when necessary.

With CFD consulting, these infrastructure requirements are generally handled as part of the consulting engagement.

This can be particularly valuable for organizations that need advanced CFD occasionally but do not want to maintain expensive computing resources throughout the year.

CFD Consulting vs. In-House CFD: Which Should You Choose?

A simple way to think about the decision is:

Consider in-house CFD if:

• You expect continuous CFD work throughout the year.
• CFD is central to your product-development process.
• You repeatedly analyze similar systems.
• You want to build long-term internal simulation expertise.
• You can keep specialized CFD engineers consistently utilized.

Consider CFD consulting if:

• You need CFD occasionally.
• The current project requires specialized expertise.
• You don’t want to invest in CFD software and computing infrastructure.
• You need additional capacity quickly.
• You are investigating an unusual engineering problem or failure.
• Your internal engineering team needs independent simulation support.

For many small and midsize engineering organizations, manufacturers, equipment operators, and legal or insurance teams, outsourcing CFD can provide access to advanced simulation capabilities without the fixed cost of maintaining a dedicated CFD department.