1-D to 3-D CFD System Design for Turbomachinery

24 April 2018 - Düsseldorf

EnginSoft & ISimQ: Flownex Turbomachinery Symposium


8:30 – 9:00 Registration and Coffee Break

09:00 – 09:15 Welcome

09:15 – 10:30 Introduction to Flownex

  • What are the aim and benefits of 1-D CFD simulation
  • Capabilities: steady-state, transient, single- & multi-phase flows
  • Components library and example cases
  • General References

10:30 – 11:00 Coffee Break

11:00 – 12:00  Flownex application in turbomachinery

  • Pump and system integration including slurry systems
  • Compressor and turbine system integration including transients
  • Detailed combustor analysis
  • Detailed secondary air system analysis
  • Detailed blade cooling analysis

12:00 – 12:30  Coupling of 1-D and 3-D Codes in ANSYS CFD – Basics, Benefits & Applications

12:30 – 13:30 Lunch

13:30 – 14:00 From 1-D to 3-D, the Flownex coupling with ANSYS

  • Workbench & Flownex as an ANSYS App
  • Mechanical & Thermal transient analyses
  • CFX (and Fluent) & 3-D CFD models at a system level

14:00 – 14:45     Flownex applied in system integration

  • Typical use and application cases of Flownex in pumping systems
  • Typical use and application cases of Flownex in compressor and turbine systems

14:45 – 15:15  Coffee Break

15:15 – 16:00  Flownex applied in the design of turbine engines

  • Flownex applied to combustor design
  • Flownex applied to secondary air systems
  • Flownex applied to blade cooling systems

16:00 – 16:15 Wrap up

  • Questions
  • Follow up


A 1D-CFD simulation (also called system level CFD) is a CFD simulation that focuses on the entire system rather than on the details of the continuum flow inside a specific component of that system.

A 1D-CFD simulation models individual system components using empirical laws or performance maps. The components are then combined in a system simulation.

The workshop will discuss typical physical aspects of turbomachinery applications using the 1D-CFD system tool Flownex, and present examples, references and best practices as reported in the program.

1D System Design for Turbomachinery

Systems related to turbomachinery, from the smallest to the largest, must operate in many different scenarios and under different operational and often extreme conditions. Moreover, they can undergo operational and emergency manoeuvres such as the pump tripping or valve movements, that may cause severe pressure surges (water hammer) and may damage the system and cause serious safety issues.

Since it is not possible to test most systems before their installation, it is of paramount importance to create the most reliable design in an early phase of the project. Since simulations at a system level take from just a few seconds to a few hours to run, it is possible to test hundreds or even thousands of different configurations, different operation conditions and scenarios during the pre-design and design phases. The results provide engineers with a deep understanding of the system’s performances and sensitivity to different conditions.

Typical physical aspects covered in the 1D-CFD system tool Flownex, are:

  • Pressure drop calculations in each component and the entire system
  • Steady-state flow balancing and sizing of the whole system
  • Water hammer effect (pressure surge) in transient incompressible analyses
  • Joule-Thomson effect and wave propagation in compressible transient simulations
  • Swirling flows and swirl transfer among rotating components
  • Heat transfer in the system and between the system and its surroundings
  • Multi-phase flows (phase change, liquid-gas mixtures)

Typical system simulation activities in the turbomachinery sector are:

  • System balancing and component sizing
  • Emergency manoeuvres (e.g. valve closure) to verify that no cavitation occurs and that maximum pressure does not exceed its maximum allowable value
  • Pump tripping due to a power-off to simulate the response of the system to such a failure
  • System warm-up to evaluate the time required to reach the optimal temperature of the system
  • Power matching and determination of  operating  points on compressor and turbine characteristics
  • Simulation of transient events such as start-up or load change
  • Calculation of surge margins for compressors
  • Heat-exchanger performance
  • Cavities, vortices, rotating channels and nozzles pressure differential and power transfer calculation
  • Labyrinth seal pressure drop calculation

1D – 3D System Coupling

1D-CFD and 3D-CFD systems are not in competition. On the contrary, they should be viewed as complementary where components in the 1D network can be characterised using data coming from 3D-CFD simulations, and 1D-CFD simulations can be used to identify boundary conditions for 3D-CFD simulations. The information exchange between the software tools can be done using the ANSYS (Mechanical, CFX and Fluent) coupling link in Flownex.

EnginSoft & ISimQ: Flownex Turbomachinery Symposium


24th April 2018 - Düsseldorf 


Lindner Hotel Airport 
Unterrather Straße 108
40468 Düsseldorf | Germany
Web site

In collaboration with


€ 150,00 including one month trial of Flownex





Please contact
Wiebke Weber