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The CSWP-FS exam has 13 questions and runs 1 hour 30 minutes.
These 10 free CSWP-FS questions are organized by exam domain, so you can see how each part of the Certified SOLIDWORKS Professional - Flow Simulation (CSWP-FS) blueprint is tested. Reveal the answer and explanation under each question.
Air in a heated duct remains below Mach 0.1, but its temperature rises from 300 K to 500 K while absolute pressure changes by less than 1%. A reviewer proposes a uniform-density model solely because the flow is low Mach. For predicting the local velocity field, which density treatment is justified?
Correct answer: C - Allow density to vary with local absolute pressure and temperature.
During an external-flow study of a sensor housing, doubling only the downstream extent of the computational domain changes predicted drag by 9%. Cell sizes around the housing and throughout the original wake region are preserved. A further downstream extension changes drag by 0.3%, and additional local refinement in the longer domain changes it by 0.2%. All runs meet their iterative stopping criteria; the required sensitivity limit is 1%. These comparisons primarily identify:
Correct answer: A - Sensitivity to downstream boundary placement in the original domain.
A coolant manifold has three outlet branches with different hydraulic resistances. The total inlet mass flow is measured, and the static pressure at each outlet section is known. The purpose of the simulation is to predict how the inlet flow divides between the branches. Which boundary-condition arrangement preserves that purpose?
Correct answer: B - Specify the measured inlet mass flow and a static-pressure boundary at each outlet.
An engineer signs off a static mixer because its mass-flow-weighted outlet additive fraction is 0.25 and its species balance closes. The product specification requires a local additive mass fraction of 0.23-0.27 everywhere across the outlet. Before accepting the claim of adequate uniformity, examine:
Correct answer: B - The minimum and maximum local additive mass fractions across the full outlet section.
A water-cooled aluminum block is explicitly modeled as a solid plus its channel fluid. Both the solid hot-spot temperature and coolant temperature rise must be predicted. Heat input is known, thermal contact is ideal, and wall temperature is not prescribed. The solid-fluid interface should be treated by:
Correct answer: A - Solve solid conduction and fluid energy together, matching interface temperatures and balancing heat flux across the solid-fluid boundary.
To protect adjacent insulation, a braking resistor case must remain at or below 110°C during continuous 60 W operation. Treat the case as isothermal. All its heat reaches 40°C ambient air through one series path: contact resistance 0.90 K/W, housing conduction resistance 0.20 K/W, and external convection resistance 0.40 K/W. The resistances are constant. Which single modification brings the predicted steady case temperature within the limit?
Correct answer: A - Halve the contact resistance to 0.45 K/W.
A sealed air test cell circulates by natural convection in the laboratory, but its simulation shows almost no motion. The setup audit reads: opposite vertical walls at 70°C and 25°C; heat transfer and temperature-dependent density enabled; initial velocity zero; gravity zero. Which correction restores the missing driving mechanism while preserving the tested device?
Correct answer: C - Enable downward gravity while retaining the sealed cavity and zero imposed through-flow.
A horizontal diffuser carries steady, low-speed air flow with no fan, heat input, or moving wall between its inlet and outlet. Using consistent averaging and a common pressure reference, the results show that static pressure increases downstream while total pressure decreases. How should these findings be interpreted?
Correct answer: D - The diffuser recovers static pressure as the flow slows, while irreversible losses reduce total pressure.
An air-flow controller reports 180 standard L/min, referenced to 300 K and 100 kPa absolute. At the modeled inlet, the same air is at 450 K and 200 kPa absolute. Treat the air as an ideal gas. The inlet condition requires actual volume flow in m³/s, not standard volume flow. Which entry preserves the mass flow reported by the controller? Use 1 L = 0.001 m³ and 1 min = 60 s.
Correct answer: C - 0.00225 m³/s
Three progressively refined meshes are solved for the same heated enclosure. On every mesh, the pressure-drop and peak solid-temperature goals have stopped drifting with iteration. Refinement from medium to fine changes pressure drop by 0.4% and peak temperature by 6 K; refinement from fine to very fine changes them by 0.2% and 4 K. The specified mesh checks require the latest changes to be no greater than 1% and 1 K, respectively. What is the defensible next step?
Correct answer: D - Pressure drop meets its mesh check; continue spatial refinement to assess the peak temperature.
The CSWP-FS exam also covers these domains. Drill them in the full free practice test:
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