Sea Robot Motion Immersed in the Water, Dynamic Mesh, ANSYS Fluent

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In this project, the moving of a robot (cube) in water is simulated.

This ANSYS Fluent project includes Mesh file and a Training Movie.

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Project description

In this project, the moving of a robot (cube) in water is simulated. The water enters the inlet boundary with a velocity of 1.5m/s while the robot moves towards this boundary with a velocity of 3m/s. The dynamic mesh model is activated and smoothing and remeshing options are enabled. Remeshing occurs every 50 iterations in order to generate a new high-quality mesh. The standard k-epsilon model is exploited to solve turbulent fluid flow equations. It should also be mentioned that the motion of robot is applied to it via a PROFILE.

Sea Robot Geometry and mesh

The geometry of this project is designed in design modeler software and meshed in ANSYS meshing. The mesh type used for this geometry is unstructured, and the element number is 30010.


Sea Robot Motion CFD simulation settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation is transient.
  • The effect of gravity is neglected.

The applied settings are summarized in the following table.

Viscous model k-epsilon
k-epsilon model Standard
Near wall treatment Standard wall functions
Dynamic mesh on
Mesh methods Smoothing & remeshing
Boundary conditions
Inlet Velocity inlet
Inlet 1.5 m/s
Outlet Pressure outlet
Gauge pressure 0 Pa
Robot Profiles v-x = 3 m/s @ t = (0-3)s


Solution Methods
Pressure velocity coupling   SIMPLE
Spatial discretization Pressure Second order
momentum Second order upwind
Turbulent kinetic energy First order upwind
Turbulent dissipation rate First order upwind
Initialization method   Standard
gauge pressure 0 Pa
Velocity 0 m/s
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3


As can be seen in velocity contour, streamlines, and velocity vectors, due to the movement of the robot (cube) towards the inlet boundary, the wake region is formed behind the cube.

Mesh file is available in this product. By the way, the Training File presents how to solve the problem and extract all desired results.


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