Automatic Mesh cell type bolt

Combining TwinMesh and ANSYS CFX offers engineers a unique, efficient, and fast workflow for transient, three-dimensional computational fluid and thermal analyses of gerotor pumps, lobe pumps, gear pumps, screw compressors, and scroll compressors at maximum reliability. 

TwinMesh is a novel meshing software for positive displacement (PD) machines with one or two axially parallel rotors and continuous (e.g. gerotor pumps) or discontinuous (e.g. screw compressors, lobe pumps) rotor geometries.

Our software automatically generates high quality structured meshes of the rotating parts of PD machines and eliminates common numerical limits. TwinMesh drives real innovation in the field of PD machines helping engineers to realise a faster time-to-market, higher machine quality, longer durability, and decreasing development costs.

TwinMesh - Easy Import

Easy Import

In TwinMesh the import of rotor and casing contours is realised as a 2D cross section via IGES format or CSV text files. Casing curves can also be generated in TwinMesh. All these contours can be easily scaled in order to modify e.g. clearance dimensions between rotors and casing. Rotor positions can also be adapted after the import defining axis-positions for the directions X and Y. If required, TwinMesh then automatically generates interfaces between the rotor meshes.

TwinMesh - Auto Generation of Hexahedral Meshes

Auto Generation of Hexahedral Meshes

In the next step TwinMesh generates hexahedral meshes for all user defined rotation angles. Using special smoothing algorithms the software takes care of a sufficient gap resolution, smooth changes between small gaps and larger chambers and an homogeneous element distribution.

TwinMesh - Easy Export

Easy Export

After a final check of the numerical quality the grids can be exported as 3D model or as 2D model. The export data of TwinMesh contains all required meshes for a transient flow simulation as well as the required routines for the automatic mesh import while running the simulation in ANSYS CFX. Also, a ready-to-run simulation template is exported by TwinMesh, which enables an immediate start of a flow analysis with ANSYS CFX. Using the structured grids from TwinMesh singlephase and multiphase CFD and CHT simulations can be performed in ANSYS CFX.

You are welcome to attend our free webinar on „TwinMesh for Reliable CFD Analysis of Rotating Positive Displacement Machines“. Please feel free to ask our experts about the advances in TwinMesh capabilities after the webinar.



  • Brief introduction to CFD-simulations of rotating machinery
  • Fast and efficient workflow for mesh generation and model setup using TwinMesh
  • Simulation of PD machines using ANSYS CFX
  • Examples: gerotor, lobe and gear pumps, screw and scroll compressors, Wankel engine, and progressive cavity pumps

For more information please visit "Webinar TwinMesh".


About ANSYS, Inc.

Founded in 1970, ANSYS employs nearly 3,000 professionals, many of whom are expert M.S. and Ph.D.-level engineers in finite element analysis, computational fluid dynamics, electronics, semiconductors, embedded software and design optimization. Our exceptional staff is passionate about pushing the limits of world-class simulation technology so our customers can turn their design concepts into successful, innovative products faster and at lower cost. 

Engineering simulation is our sole focus. For more than 45 years, we have consistently advanced this technology to meet evolving customer needs.
ANSYS develops, markets and supports engineering simulation software used to predict how product designs will behave in real-world environments. We continually advance simulation solutions by

  • Developing or acquiring the very best technologies
  • Integrating them into a unified simulation platform capable of complex, multiphysics solutions
  • Providing system services, including high-performance computing (HPC) and Cloud solutions, to manage simulation processes and data

Since its founding, ANSYS has evolved from a single office that housed a small group of engineers to an international corporation with offices on three continents.

ANSYS is headquartered in the United States, south of Pittsburgh in Canonsburg, Pennsylvania. We have more than 75 strategic sales locations throughout the world with a network of channel partners in 40+ countries. Together the company fosters close partnerships with customers and provides local value-added service and support.


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