- What You Are Actually Preparing For
- Exam Mechanics: Format, Fee, Software and Retakes
- Domains 1-3: Fluids, Flow Types and Multiple Inlets or Outlets
- Domains 4-6: Mixing, Conjugated Heat Transfer and Convection
- Domains 7-11: Results, Units, Configurations, Studies and Mesh
- Mesh Size, Solver Time and Result Trust
- Building Hands-On Practice Problems That Match the Exam
- A Domain-Ordered Study Schedule
- Exam-Day Tactics for a Timer You Cannot Pause
- Frequently Asked Questions
- The exam is 13 hands-on questions in 90 minutes, with a 70% minimum passing grade.
- The issuer lists 11 unweighted topics, so prepare every one rather than guessing at weightings.
- The fee is US$49 for one attempt in the North American catalog, excluding software and training.
- You need licensed SOLIDWORKS with Flow Simulation 2018 or later; the timer cannot be paused.
What You Are Actually Preparing For
The credential this guide covers is the Certified SOLIDWORKS Professional - Flow Simulation, which SOLIDWORKS (Dassault Systemes) publicly designates as SOLIDWORKS Flow Simulation Professional, CSWP-Flow. On this site we use the CSWP-FS label for the same exam. If you want the basics of naming first, see What Is CSWP-FS? and What Does CSWP-FS Stand For?.
This is not a theory test. You sit in front of SOLIDWORKS, open models, set up fluid-flow studies, run them, and interpret what comes out. The issuer also expects a basic understanding of the finite volume method, the numerical approach behind the solver, so you should be able to explain why a mesh or a boundary condition changes an answer, not just where to click.
That distinction matters for how you study. A generic multiple-choice bank will teach you vocabulary but will not teach you to catch a flipped inlet direction, a wrong unit system, or a result that is physically implausible. The most effective preparation is repeated, deliberate time inside the software.
Exam Mechanics: Format, Fee, Software and Retakes
Know the logistics cold so none of them surprise you on test day.
| Item | What the issuer states |
|---|---|
| Format | 13 hands-on questions |
| Time limit | 90 minutes; the online timer cannot be paused |
| Passing grade | Minimum 70% |
| Fee | US$49 for one attempt in the North American catalog, excluding software and training |
| Delivery | SOLIDWORKS through Tangix/VirtualTester; current instructions use the VirtualTester Web Client |
| Software | SOLIDWORKS Standard with Flow Simulation 2018, or SOLIDWORKS Student Edition 2018, or later, as specified on the exact exam page |
| Retakes | At least 14 days between attempts, plus another CSWP-Flow exam credit |
| Validity | The issuer's 2020 certification Q&A states customer and student certifications do not expire |
A few practical notes. You supply your own compatible licensed software and Internet access, so budget for those separately from the exam credit. Current browser-client instructions supersede older TesterPRO setup references you may find in forum threads, so follow the issuer's present instructions rather than old walkthroughs. For a full cost picture, see CSWP-FS Certification Cost 2026, and for eligibility questions read CSWP-FS Requirements 2026. The general certification FAQ imposes no prerequisite certification for Professional exams, though the Flow Simulation course and Learning Path are the recommended preparation.
The 70% threshold is a score, not a pass rate. Published population pass rates were not verified, so be skeptical of any site that quotes one with confidence. Our own discussion is in CSWP-FS Pass Rate 2026: What the Data Shows, and the scoring specifics are in CSWP-FS Passing Score 2026.
Domains 1-3: Fluids, Flow Types and Multiple Inlets or Outlets
The issuer lists 11 exam topics without weights. That means you should not assume the first topics are lighter or heavier than the last. The complete list is walked through in CSWP-FS Exam Domains 2026: Complete Guide to All 11 Content Areas; here is how to prepare for each cluster.
Domain 1: Liquids and gas
You must choose and apply the right fluid for the problem and understand how its properties drive the result.
- Practice switching a study between a liquid and a gas and predicting how pressure drop and velocity should respond.
- Check that fluid selection is consistent with the physics you are modeling, such as compressible versus incompressible behavior.
- Be able to explain why density and viscosity differences change results.
Domain 2: Internal and external flow simulations
Internal flow is bounded by walls, as in pipes and manifolds, while external flow surrounds a body, as in airflow over a vehicle part.
- Internal studies typically need closed-cavity handling, lids to seal openings, and inlet and outlet conditions.
- External studies depend on a sensibly sized computational domain around the object.
- Know how each type is selected at wizard stage, because a wrong choice early propagates through the whole study.
Domain 3: Internal systems involving multiple inlets or outlets
Real manifolds and branching systems rarely have just one in and one out.
- Practice assigning different boundary condition types to different openings, such as a velocity or mass flow at one inlet and a pressure at an outlet.
- Avoid over-constraining the system; specifying every opening with a flow rate can create an inconsistent problem.
- Verify that flow in equals flow out when the physics demand it.
Domains 4-6: Mixing, Conjugated Heat Transfer and Convection
Domain 4: Mixing of various fluids
These problems involve more than one fluid entering a system and combining.
- Understand how to define the fluids and set up each inlet with the correct fluid assignment.
- Know what result quantity tells you about mixing, such as concentration or temperature at a downstream location.
Domain 5: Conjugated heat transfer
Conjugated heat transfer couples heat conduction in solids with convection in the fluid, the classic case being a heat sink cooled by air.
- Practice assigning solid materials and heat sources, then reading the resulting temperature field.
- Check that the solid is included in the study rather than treated only as a boundary.
- Be ready to extract a maximum or average temperature on a component.
Domain 6: Natural and forced convection
Forced convection is driven by a fan or imposed flow; natural convection is driven by buoyancy from temperature differences.
- Natural convection requires gravity to be defined, a detail that is easy to forget under time pressure.
- Understand how each case changes the boundary conditions and the expected flow behavior.
Domains 7-11: Results, Units, Configurations, Studies and Mesh
These topics are less glamorous than the physics, and they are where time disappears if you are not fluent.
Domain 7: Extracting results such as force, velocity, or pressure
Getting a number out of a finished study is a core exam skill.
- Practice surface goals, point values, and probes, and know the difference between a goal defined before solving and a value read afterward.
- Be comfortable reading force on a face, pressure drop between two openings, and velocity at a location.
- Confirm the result is reported in the unit the question asks for.
Domain 8: Working with various units
Questions can mix unit systems, and a correct simulation reported in the wrong unit still earns no credit.
- Know where to set the project unit system and where to change result display units.
- Convert flow rates carefully between volumetric and mass forms.
Domain 9: Working with configurations
Configurations let one model represent design variants, and Flow Simulation studies are tied to them.
- Practice running a study on one configuration, then switching and re-running.
- Understand that geometry changes across configurations may require rebuilding the mesh.
Domain 10: Duplicating and editing studies
Cloning a project and modifying it is far faster than starting from scratch, and the exam rewards that efficiency.
- Practice cloning a finished project and changing a single input, such as an inlet velocity.
- Know which settings carry over and which need re-checking after a clone.
Domain 11: Controlling mesh size
Mesh settings control both accuracy and run time, so this topic deserves its own treatment, covered next.
Mesh Size, Solver Time and Result Trust
The exam's basic finite-volume-method expectation shows up most clearly in mesh questions. The computational domain is divided into cells, and the solver balances fluxes through each cell. Finer cells capture gradients better but cost more time; coarser cells solve quickly but can blur or miss important features.
- Global mesh level: A single control that makes the whole mesh finer or coarser. Raising it is the blunt instrument.
- Local refinement: Targeting small features, thin gaps, or steep gradients without paying for fine cells everywhere.
- Time awareness: With 13 questions in 90 minutes, an overly fine mesh that runs for a long time can cost you more than it earns.
- Convergence versus accuracy: A study that has converged on a poor mesh is converged, not necessarily correct.
Key Takeaway
On timed questions, start with a reasonable mesh, check whether the result is plausible, and refine only if the question demands more precision. Practice estimating how long a run will take so you can decide quickly.
Building Hands-On Practice Problems That Match the Exam
Because the exam is performance-based, your practice material should be too. Rather than hunting for leaked questions, which we do not endorse and cannot verify, build a small library of your own problems and a repeatable result check for each. If you want structured practice alongside your own models, our CSWP-FS practice test can help you rehearse the thinking.
- Straight pipe with a pressure drop: One inlet, one outlet, internal flow. Verify pressure drop against a rough hand estimate.
- Manifold with multiple outlets: Practice Domain 3 by splitting flow and confirming mass balance.
- Heat sink in a duct: Conjugated heat transfer with a heat source on the solid, reading a maximum temperature.
- Two-fluid junction: A mixing tee where you read a downstream property.
- Buoyancy-driven cooling: A natural convection case with gravity set deliberately.
- External flow over a bluff body: Extract drag force and compare two configurations.
For each, practice the whole loop: set units, set up, mesh, run, extract the requested value, then clone the project and change one input. That final clone step exercises Domains 9 and 10 repeatedly. For a sense of how demanding this feels, see How Hard Is the CSWP-FS Exam?
For official preparation, the SOLIDWORKS Flow Simulation course and Learning Path are the recommended route. The two-day training course is a learning resource, not a mandatory training-hours requirement and not related to the 90-minute exam timer. More detail on options is in CSWP-FS Training.
A Domain-Ordered Study Schedule
Since the topics are unweighted, spread effort evenly and front-load the foundations that everything else depends on. Adjust the pace to your experience; this outline assumes you can already operate SOLIDWORKS comfortably.
Foundations: Domains 1, 2, 8
- Fluid selection, internal versus external setup, and unit handling.
- Run the straight-pipe problem until setup is automatic.
Boundary logic: Domains 3, 7
- Multi-inlet and multi-outlet manifolds.
- Extract force, pressure, and velocity every time you solve.
Thermal and mixing physics: Domains 4, 5, 6
- Heat sink, mixing tee, and natural convection cases.
- Predict the outcome before each run.
Efficiency and review: Domains 9, 10, 11
- Configurations, cloning, and mesh-versus-time trade-offs.
- Run two or three full 90-minute simulated sessions.
Practice the clone-and-edit workflow last because it speeds up every earlier topic, and keep a one-page list of the settings you most often forget, which our CSWP-FS Cheat Sheet can seed.
Exam-Day Tactics for a Timer You Cannot Pause
With 13 questions in 90 minutes, you have roughly seven minutes per question on average, but runs and meshing will not be evenly distributed. Plan around that.
- Check your setup first: Confirm your licensed SOLIDWORKS and Flow Simulation version and your connection before starting, since the timer cannot be paused.
- Read the whole question: Note the requested unit and the exact quantity before touching the model.
- Triage by solver cost: If a question needs a heavy run, start it and work on lighter items while it computes where the workflow allows.
- Sanity-check every answer: A quick plausibility check catches sign errors, wrong units, and flipped boundary directions.
- Do not rely on a retake: A retake needs at least 14 days and another exam credit, so aim to pass the first time.
Check scheduling specifics in CSWP-FS Exam Dates 2026 before you book, and review the broader credential background in CSWP-FS Certification.
Weighing the Career Value
Flow Simulation skills are most relevant to roles involving thermal management, fluid handling, HVAC-style analysis, and product design where airflow or liquid flow affects performance. Employers tend to value demonstrated project work alongside the credential, so pair your preparation with portfolio-style examples rather than treating the certificate as a guaranteed pay increase. Compensation depends heavily on role, industry, and region, so we avoid quoting figures here. For a grounded view, read CSWP-FS Salary Guide 2026, Is the CSWP-FS Certification Worth It?, and CSWP-FS Jobs.
Frequently Asked Questions
The exam has 13 hands-on questions with a 90-minute time limit. The online timer cannot be paused, so plan your time before you start.
The minimum passing grade is 70%. That is the passing score, not a published pass rate, and population pass rates have not been verified.
The North American catalog lists US$49 for one attempt, excluding software and training. You must also supply compatible licensed SOLIDWORKS with Flow Simulation 2018 or later, plus Internet access.
The general certification FAQ imposes no prerequisite certification for Professional exams. The Flow Simulation course and Learning Path are recommended preparation rather than mandatory requirements.
A retake requires waiting at least 14 days and purchasing another CSWP-Flow exam credit. Use the waiting period to rebuild the weakest topics with fresh hands-on problems.
The issuer's 2020 Certification Program Q&A states that customer and student certifications do not expire. Check the current official pages if you need the latest policy wording.
Passing on the first attempt comes down to fluency: setting up the right study quickly, trusting your results because you have checked them, and managing mesh and run time under a hard clock. Work through all 11 topics hands-on, use our practice resources to rehearse, and revisit the CSWP-FS study guide as your checklist.