Fluid and Pipe Materials
The Fluid and Pipe Materials node is the main node in the Pipe Mechanics interface. This is where you enter the material data for both the pipe itself and the fluid contained in the pipe.
It is common that the material data for the fluid and the pipe material are in located in different Material nodes. Only one material can however be assigned to a certain edge. For this reason, the assignment of material data can be made not only using the material assigned to the edge, but by accessing any Material node present in the component.
By adding the following subnodes to the Fluid and Pipe Materials node you can incorporate many other effects:
Fluid Properties
For the structural analysis point of view, the only required property of the fluid is its mass density.
For input of the Density, ρf, select either From material or User defined. When using From material, also select the material to use in the Fluid material list. This list contains all materials present in the component, as well as the default choice Edge material. When Edge material is selected, the material currently assigned to the edge (2D: boundary) is used.
For User defined, enter a value or expression.
Pipe Properties
In this section, you define the linear elastic material properties.
If the option From material used for any of the material properties below, you must select a material from the Pipe material list. This list contains all materials present in the component, as well as the default choice Edge material. When Edge material is selected, the material currently assigned to the edge (2D: boundary) is used.
Specification of Elastic Properties for Isotropic Materials
From the Specify list, select a pair of elastic properties for an isotropic material. Select:
Young’s modulus and Poisson’s ratio to specify Young’s modulus (elastic modulus) E and Poisson’s ratio ν.
Young’s modulus and shear modulus to specify Young’s modulus (elastic modulus) E and the shear modulus G.
Bulk modulus and shear modulus to specify the bulk modulus K and the shear modulus G.
Lamé parameters to specify the Lamé parameters λ and μ.
Pressure-wave and shear-wave speeds to specify the pressure-wave speed (longitudinal wave speed) cp and the shear-wave speed (transverse wave speed) cs.
For each pair of properties, select from the applicable list to use the value From material or enter a User defined value or expression.
Each of these pairs define the elastic properties, and it is possible to convert from one set of properties to another.
Density
Define the Density ρ of the material. Select From material to take the value from the material or User defined to enter a value for the density.
Location in User Interface
Context Menus
Ribbon
Physics tab with Pipe Mechanics selected: