Lixing Gu's profile - activity

The value stored in a diagonal entity in MA array is a sum of mass flow rates toward this node.

If an nxn matrix has 0 value at any diagonal entity, this square matrix is not invertible and is called singular. The section of code is used to check singularity to prevent the solver from crashing. The main reason to cause singularity is that this node may not network correctly, as mentioned by Jason.

Hope this helps.

Thanks for letting me know your modification. When you reset deltaP=deltaPmax, you should be able to get the flow rate you want. Could you let me know what deltaP is reported? How much difference between deltaP and deltaPmax?

The Airflow Network is unable to do what you want. The model calculates flow rate based on pressure difference across a crack only. I will add an enhancement item for future development.