The DF_DBMTM is a User Defined Function (UDF) for Fluent. This code brings the capabilities of Dynaflow's bubble tracking and dynamics analysis code, DF_Multi_SAP in to the flexibility and user friendliness of Fluent.

What does the DF_DBMTM do?

  • DF_DBMTM enables Fluent users to include the presence of bubble nuclei or purposely injected bubbles in their flow modeling.
  • DF_DBMTM follows individual bubbles and computes their dynamics.
  • DF_DBMTM works within Fluent similar to Fluent's discrete phase model (DPM) particle tracking.

Why do I need it?

  • Practically all liquids contain microscopic bubble nuclei.
  • At low pressures or high velocities these can affect the flow significantly.
  • Bubble dynamics is important for flows with large pressure gradients.
  • The presence of these bubble nuclei is accounted for with this UDF.
  • Bubble behavior and acoustic noise are modeled.
  • It is the tool for studies on cavitation inception, bubble nuclei effects, noise from the bubbles, propulsion modification, etc.
  • Industry and Navy applications: flows in pipes, jets, pumps, propellers, ships, ocean, etc.

DF_DBMTM, Version 1.0

  • Bubble dynamics (incompressible & compressible)
  • Bubble tracking (that works with several DPM options)
  • Works with 2D & 3D, steady and unsteady
  • Post-processing using the Fluent GUI
  • Compatible with Fluent 6.2 and later
  • Platform: Windows XP (Please check with DYNAFLOW for other platforms.)


  • Propellers, impellers, water jets
  • Cavitation inception
  • Ship wake noise signature
  • Bubble-flow interaction
  • Suitable for bubble dynamics, cavitation, noise studies