Modeling Jet Fans in Parking Ventilation in Ansys CFX

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SUMMARY

The discussion focuses on modeling jet fans in a parking ventilation system using ANSYS CFX. The user has implemented a fresh air inlet and exhaust outlet, with jet fans represented as subdomains incorporating momentum sources based on thrust calculations. Despite following this methodology and conducting a transient analysis, the user reports unrealistic results. The conversation emphasizes the importance of accurately modeling jet fans and smoke to achieve reliable simulation outcomes.

PREREQUISITES
  • Understanding of ANSYS CFX software for computational fluid dynamics (CFD)
  • Knowledge of boundary conditions, specifically Opening BC and Outlet BC
  • Familiarity with modeling momentum sources in CFD simulations
  • Basic principles of transient analysis in fluid dynamics
NEXT STEPS
  • Research best practices for modeling jet fans in ANSYS CFX
  • Explore the implementation of smoke modeling techniques in CFD
  • Learn about troubleshooting common issues in transient CFD simulations
  • Investigate the technical specifications provided by jet fan manufacturers for accurate modeling
USEFUL FOR

This discussion is beneficial for CFD engineers, HVAC designers, and anyone involved in simulating ventilation systems, particularly those using ANSYS CFX for modeling airflow and smoke dispersion in complex environments.

tj00343
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Hi , I'm new to CFD. I'm modeling a parking ventilation system in ansys CFX. I'm having some trouble modeling the jet fans . I went as follows. I created a fresh air inlet (Opening BC), an exhuast outlet (outlet BC) and in the middle I distributed jet fans .The jet fans are modeled as sub domains with momentum sources(momentum calculated from the thrust). In addition, I simulated a fire through flow inlet BC at a surface with and additional variable(smoke). I ran a transient analysis. The problem is the results seem unreal.
Generally, how does my methodology look. Am I on the right track. Any tips or ideas about why my results seem unreal.
Thank You
 
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I've just looked at some jet fan manufacturers websites . In each case they give comprehensive technical information about their products .

The information provided seems to tell you everything you need to know .

Please describe what specific difficulties you have .
 
Last edited:
My specific difficulties have to do with how to numerically model the jet fans and smoke in ansys cfx
 

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