Numerical Simulation and Comparison of Flow Field in Different Dynamic Co-Culture Conditions.

Area of Science:

• Biotechnology
• Bioengineering
• Computational Science

Background:

• Bioreactor technology automates cell expansion but understanding internal flow fields is challenging.
• Experimental methods struggle to fully characterize the complex environments within bioreactors.
• Computational Fluid Dynamics (CFD) provides a powerful tool to analyze fluid dynamics and their impact on cell culture.

Purpose of the Study:

• To simulate and analyze the flow field and fluid shear stress (FSS) in Rotary Cell Culture Systems (RCCS) and Spinner Flasks (SF).
• To compare the hydrodynamic environments of RCCS and SF for optimizing cell-microcarrier culture.
• To evaluate the suitability of different bioreactors for dynamic cell culture applications.

Main Methods:

• Utilized FLUENT software for Computational Fluid Dynamics (CFD) simulations.
• Simulated dynamic pressure, shear stress, and velocity distributions within RCCS and SF.
• Analyzed FSS on particles of two diameters at various positions and rotational speeds.

Main Results:

• Identified distinct flow patterns in SF, including static zones unfavorable for material exchange.
• Demonstrated that RCCS offers a more conducive environment for material exchange compared to SF.
• Detailed analysis of FSS distribution on particles provided insights for optimizing bioreactor operation.

Conclusions:

• Rotary bioreactors (RCCS) show greater potential than spinner flasks (SF) for dynamic cell culture.
• CFD simulations offer valuable visualization of bioreactor hydrodynamics for improved cell culture processes.
• Understanding local hydrodynamic changes is critical for optimizing cell-microcarrier complex culture.