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EDRMedeso portal Blogg Nyhetsbrev Ledige stillinger

Forsiden Produkter Kurs og seminarer Konsulenttjenester Referanser Om EDRMedeso Support Kontakt oss Forsiden / Blogg / ANSYS-bloggen / CFD TUTORIAL – RIGID BODY MODELING

CFD TUTORIAL – RIGID BODY MODELING If you want to get started with the rigid body modeling you should be aware of that the modeling setup,

mesh displacement and rigid body motions are depended on the complexity of your system

Maybe a mesh displacement can be restricted to one domain,

or a subdomain with sliding mesh is sufficient to model the rigid body

? We will help you with these questions and will further recommend that you make a sketch of your system to decide which parts are needed to be moved,

this will make the modeling of domains and interfaces in DesignModeler easier

This tutorial will briefly show three different ways of how to use the Rigid Body 6DOF solver in CFX v

We hope this will be a good start if you want to begin using the final release of the CFX Rigid Body solver

A rigid body is a solid object that moves through a fluid without itself deforming

Its motion is dictated by the fluid forces and torques acting upon it,

plus any external forces as gravity and external torque

A rigid body is defined by a collection of 2D regions that form its faces

The rigid body itself does not need to be meshed

Mesh motion is used to move the mesh on the rigid body faces in accordance with the solution of the rigid body equations of motion

The tutorial is not described in detail and will only work as a guidance of how to set up a simulation that includes a Rigid Body

Recommended prerequisites

The hatch is fixed at one axis and will have a rotational motion

We have modeled a simple plate and generated a surrounding fluid domain

The hatch is enclosed in a cylindrical domain to allow rotational motion of model

See illustration of the domains in Figure 1

The 2D wall boundaries which constitute the hatch surface define the rigid body

See close view in Figure 2

Figure 1

The computational domain consists of a box and a cylinder

The cylindrical domain encloses the Rigid Body,

the hatch which is fixed at the x-axis

The walls,

which constitute the hatch is visualized in green

A rotation of the modeled hatch will consequently rotate the cylinder

Figure 2

The walls will define the Rigid Body

The hatch itself is not a domain

The first thing we will do is to insert a Rigid Body dialog box

To model the Rigid Body you need to specify the mass and the absolute values of the mass momentum of inertia for the rigid body with respect to a corresponding coordinate system

Furthermore,

you will need to define external force,

torque or gravity if it is present

This can be set under the Dynamic setting tab

Mark of for the correct translational and rotational degree of freedom

A typical setup for a thin plate is shown in Figure 3 and 4

You can read about the Rigid Body User interface and the definition of these settings in the ANSYS v

Figure 3

You need to set the total mass of the Rigid Body,

in this case the plate walls named Body

In addition you need to calculate the Mass Moment Of Inertia of the Rigid Body object

Figure 4

Define external forces

Gravity force is always present in drop cases

For this case the thin plate will only have one degree of freedom,

which is a rotational degree about the x-axis

When you have created your Rigid Body you can go on and define the Fluid Domain

In Basic settings shown in Figure 5 you will need to set Mesh Deformation to Region of Motion Specified

This is needed only in domains where the motion of the Rigid Body will have an influence on the mesh boundaries

Figure 5

In the Basic Settings tab of the rotating domain,

Region of Motion Specified needs to be activated

For this case we have divided the computational domain into two parts

The inner cylindrical domain will undergo Mesh Deformation when the Rigid Body moves,

while the outer rectangular domain will remain steady,

the cylindrical domain will therefore be defined as a subdomain,

The remaining now is to define how the 2D boundaries shall act

Figure 6

Define the cylindrical domain as a Subdomain

The interface between the rotating and stationary domain will be handled by the sliding mesh feature

Figure 7

The Subdomain will follow the Rigid Body motion

The modeling of Mesh Deformation is an important component for solving problems with moving boundaries

The motion might be imposed,

or might be an implicit part of a coupled fluid-structure simulation

For our case with a falling plate we want the mesh interface of the subdomain to slide on the interface to the rectangular and steady domain

To prevent the nodes on the subdomain interface to move relative to the local boundary frame we need to set the Mesh Motion of the Interface to Stationary

See Figure 8

Figure 8

The interface nodes will move relative to the local boundary frame

The Mesh Motion of the 2D wall boundaries which form the hatch surface,

will follow the Rigid Body Solution

The same setting will be applied to the Subdomain as well,

No special action is needed to set up the stationary domain,

This domain can be modeled as usual

No consideration to Mesh Motion or the Rigid Body solver is necessary

Set a proper time step for the transient analysis and you can start solving a Rigid Body motion

A movie of the falling hatch is shown below

RIGID BODY EXAMPLE 2 In the previous example we presented a very simple case to describe the Rigid Body solver

one degree of freedom and Mesh Displacement with stationary nodes

The problem was solved by sliding mesh and GGI at the interfaces

In the next example we will model a buoy at the water surface by use of the Rigid Body solver

The modeling concept is shown in Figure 9

Figure 9

Waves that are introduced in the domain will further influence the displacement of the buoy

As for the hatch you’ll need to insert a Rigid Body and define its dynamics

See example in Figure 10

The buoy will have tree degrees of freedom,

translation in x- and y direction and rotational about z-axis – see the Dynamics definition in Figure 11

Figure 10

The Mass and Moment Of Inertia of the buoy needs to be defined

Figure 11

Definition of Degrees of Freedom of the Buoy

For this case we have two distinct mesh domains,

we will introduce only one fluid domain

In the Domain Basic setting tab the multiphase of water and air is created and Mesh Deformation is activated

The free surface multiphase is modeled as usual

The buoy will be moved in several directions which mean that the mesh nodes will be displaced

To allow mesh deformation you need to define the Mesh Motion on each boundary

The modeled domain is shown in Figure12

Figure 12

Mesh domains

The buoy surface is set to follow the Rigid Body motion,

which means that the nodes will not be locally displaced

The Mesh Motion on the Fluid Fluid Interfaces between the two mesh domains are set to Conservative Interface Flux

The motion of nodes in all domains adjacent to the interface influence,

the motion of the nodes on the interface

The definitions are shown in Figure 13 and Figure 14

Figure 13

The 6DOF solver will predict the buoy behavior

The nodes will not be locally displaced

Figure 14

The nodes on the domain interface will be displaced,

this will in term skew the elements

The Mesh Motion on the wall,

symmetry and pressure outlets can be set to Unspecified – no constraints on mesh motion are applied to nodes

Their motion is determined by the motion set on other regions of the mesh

A transient simulation is prescribed and the motion of the Rigid Body and the resulting Mesh Displacement is visualized in in the following movie

A description of how to model this displacement can be found in CFX v130 Tutorial 32

RIGID BODY EXAMPLE 3 A third example is to put constrain on the Rigid Body and Mesh motion

As for the first example you may also here create a subdomain,

The subdomain will in this case follow the Rigid Body motion

Figure 15

The buoy domain is defined as a subdomain in this Rigid Body example

Furthermore,

we will have to change the setting of the Fluid Fluid Interface to oppose sliding mesh between the interfaces

The Mesh Motion of the Fluid Interfaces are set as Rigid Body Motion,

thus the mesh nodes of the subdomain will not move relative to the rectangular domain

The motion constrains of the interfaces are defined in Figure 16 and 17

Figure 16

The motion constrains of the interface in the rectangular domain

Figure 17

Mesh motion and Motion Constraints of the Interface of the Subdomain

The resulting buoy motion with sliding mesh is shown in the movie below

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