*FLUID PIPE FLOW LOSS

Specify fluid pipe element loss.

This option is used to specify the loss that happens during fluid flow through a fluid pipe element. It must be used in conjunction with the FLUID PIPE SECTION option.

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Fluid pipe elements

ProductsAbaqus/Standard

TypeModel data

LevelPartPart instance

Required parameters

TYPE

Set TYPE=BLASIUS to define the friction parameters using Blasius's equation for the friction factor.

Set TYPE=CHURCHILL to define the friction parameters using Churchill's equation for the friction factor.

Set TYPE=TABULAR to define the Reynold's number-friction values in a tabular form.

Set TYPE=USER to define the connector loss parameters using user subroutine UFLUIDPIPEFRICTION.

Optional parameters

LAMINAR FLOW TRANSITION

Set this parameter equal to the Reynold's number for the flow in the pipe below which the linear formulation is used. If this parameter is omitted, the default value is 1.0.

Data line to define connector loss (TYPE=BLASIUS)

First (and only) line

  1. Hydraulic area.

  2. Hydraulic diameter.

  3. Additional pipe length to be added to the element for increasing the friction loss.

  4. Scaling factor for the pipe length to increase friction loss in the element.

  5. Addition of a connector loss to friction factor when the fluid flows in the direction determined by the element connectivity.

  6. Addition of a connector loss to friction factor when the fluid flows opposite to the direction determined by the element connectivity.

Data line to define connector loss (TYPE=CHURCHILL)

First (and only) line

  1. Hydraulic area.

  2. Hydraulic diameter.

  3. Additional pipe length to be added to the element for increasing the friction loss.

  4. Scaling factor for the pipe length to increase friction loss in the element.

  5. Addition of a connector loss to friction factor when the fluid flows in the direction determined by the element connectivity.

  6. Addition of a connector loss to friction factor when the fluid flows opposite to the direction determined by the element connectivity.

  7. Surface roughness of the pipe used in the friction factor calculation.

Data lines to define connector loss (TYPE=TABULAR)

First line

  1. Hydraulic area.

  2. Hydraulic diameter.

  3. Additional pipe length to be added to the element for increasing the friction loss.

  4. Scaling factor for the pipe length to increase friction loss in the element.

  5. Addition of a connector loss to friction factor when the fluid flows in the direction determined by the element connectivity.

  6. Addition of a connector loss to friction factor when the fluid flows opposite to the direction determined by the element connectivity.

Second line

  1. Reynolds number.

  2. Friction coefficient.

Repeat this data line as often as necessary.

Data line to define connector loss (TYPE=USER)

First (and only) line

  1. Hydraulic area.

  2. Hydraulic diameter.

  3. Surface roughness of the pipe used in the friction factor calculation.