TwinMesh for Reliable CFD Analysis of Lobe Blowers and Expanders

Combining TwinMesh and ANSYS CFX offers engineers a unique, efficient and fast workflow for transient, three-dimensional computational fluid and thermal analysis (cfd) of roots-type blowers, superchargers, and expanders.

Design Engineers of Roots-typed Blowers Have to

  • Analyse the impacts of different operation requirements (e.g operating range, rotor speed, etc.)
  • Get a deep understanding of the details of their machine dynamics (gap flow losses, thermal effects)
  • Be able to answer specific customer demands (CoP, noise reduction, etc.) and
  • Produce fast and reliable answers.

Thanks to our novel software TwinMesh real virtual product development is now available for roots-type superchargers, blowers and expanders! TwinMesh and ANSYS CFX together allow for efficient and reliable CFD analysis of lobe blowers and expanders.

Image Velocity Distribution in a Gear Pump
Image Grid of an External Gear Pump

No More Numerical Limits

Common limitations of CFD software packages for lobe blowers such as limited physics, insufficient mesh resolution, numerical errors due to bad mesh quality or interpolation errors or limits due to the use of overlapping mesh method are redundant for the TwinMesh approach.

Using structured grids from the TwinMesh software users get access to the full capability of CFD modelling available in ANSYS CFX. The high quality meshes from TwinMesh result in reliable and stable CFD simulations for lobe blower geometries at moderate model sizes and moderate calculation times for transient analysis.

Reliable CFD Analysis of Lobe Blowers and Expanders

And what can design engineers of lobe blower ore expander geometries expect from CFD simulation? CFD simulation results generated with TwinMesh and ANSYS CFX provide design engineers of roots blowers,  expanders and roots-type superchargers with essential information such as:

  • Velocity, pressure, and temperature fields within the working chambers and in axial and radial clearances
  • Flow rates and mass flow at different operation points
  • Torques, moments, forces and machine efficiency (CoP)
  • Leakage and losses
  • Pulsation behaviour of the machine
  • Mechanical wear, lubrication and cooling
  • Duration and magnitude of acoustic sources (emission)

TwinMesh and ANSYS CFX together make a reliable, modern, and state-of-the-art engineering tool, which allows for fast, reliable and efficient analysis and optimization of oil-free, oil-injected and water-cooled roots-type machines.

 

Pressure Distribution in a Gear Pump

Better Designs

Increase machine performance, efficiency, and durability by a better understanding of complex phenomena inside your machine.

g

Speed & Flexibility

Reduce your time-to-market and fasten your response time to changing demands significantly by massive use of virtual prototyping.

Drive Innovation

Drive real innovation by getting deeper insight into the details of your products and their interaction with connected systems.

Reduced Costs

Reduce development and manufacturing costs by massive use of virtual product development instead of time consuming measurements on physical prototypes.

CFD Results of Roots Blower Simulations

Contact us for more information or book a free webinar

Related blog entries

Preview of Mesh Interpolation and Non-Reflective Boundary Conditions in TwinMesh 2018

The next preview of new features in TwinMesh 2018: we implemented a mesh interpolation method in User Fortran. So far, the time step size of the CFD simulation has to be set according to the desired revolution speed and the prescribed angle increment of the pre-generated meshes from TwinMesh. Now it is possible to set an arbitrary time step size, and the corresponding mesh is calculated with a spline interpolation between the pre-generated meshes at run-time.

read more

Preview of Non-Reflective Boundary Conditions in TwinMesh 2018

Preview on new features in TwinMesh 2018: we have implemented non-reflective boundary conditions (NRBC) in ANSYS CFX via User Fortran in a stable and robust way so that they can be used for positive displacement compressors instead of the standard openings which are reflective (RBC). While RBC lead to standing waves, especially at pressure side with mass flow strongly pulsating and even flow reversal, NRBC allow pressure fluctuations from pressure port to travel to the outlet and leave there without any artificial reflections so that mass flow is more uniform and realistic.

read more

TwinMesh Webinar

Next free TwinMesh webinar on 3rd of July 2018 at 3pm (CEST): find out more about how TwinMesh and ANSYS CFX allow for reliable 3D CFD analysis of rotary positive displacement machines such as screw compressors, lobe pumps, vane pumps, Wankel engines, gear pumps, progressive cavity pumps, or scroll expanders!

read more

TwinMesh is available for these PD Machines