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*MASS FLOW RATE

Keyword type: step

This option allows the specification of a mass flow rate between fluid nodes.

Optional parameters are OP and AMPLITUDE. OP takes the value NEW or MOD. OP=MOD is default and implies that the mass flow rates are kept over all steps starting from the last perturbation step. Specifying a mass flow rate between nodes between which a mass flow rate was defined in a previous step replaces this value. OP=NEW implies that all previous mass flow rates are removed. If multiple *MASS FLOW RATE cards are present in a step this parameter takes effect for the first *MASS FLOW RATE card only.

The AMPLITUDE parameter allows for the specification of an amplitude by which the mass flow rate values are scaled (mainly used for dynamic calculations). Thus, in that case the values entered on the *MASS FLOW RATE card are interpreted as reference values to be multiplied with the (time dependent) amplitude value to obtain the actual value. At the end of the step the reference value is replaced by the actual value at that time, for use in subsequent steps.

First line:

- *MASS FLOW RATE
- Enter any needed parameters and their value

Following line:

- First node.
- Second node.
- Actual value of the mass flow rate between the first and the second node. If the value is positive the first node is upstream, else it is downstream.

Repeat this line if needed.

    Example:

    *MASS FLOW RATE
    17,38,-1.e-4

assigns a mass flow rate of flowing from node 38 to node 17.

Example files: beamhtfc.

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