Hello friends,
I am a new COMSOL user, and I have a problem with a simple model. I am modeling a pipe in a steady state, closed loop. It is a 20cm diameter pipe with water flowing at 1 m/s forced by a pump at 31 kg/s. I am using the "Non-Isothermal Pipe Flow" module. I am using this specific module because I will add some transient heating physics later.
I cannot even get the stationary, unheated solution however. I get the familiar "Failed to find a solution. Singular matrix" error. I've read that error can be caused by too coarse a mesh or a poor initial guess. There are plenty of nodes in this simple geometry, and the initial conditions are very close to the analytical solution. There must something obvious I am missing because I am a new user.
Would anyone be willing to look my very simple model (attached) and educate me? Thank you for your time.
-Andrew
I am a new COMSOL user, and I have a problem with a simple model. I am modeling a pipe in a steady state, closed loop. It is a 20cm diameter pipe with water flowing at 1 m/s forced by a pump at 31 kg/s. I am using the "Non-Isothermal Pipe Flow" module. I am using this specific module because I will add some transient heating physics later.
I cannot even get the stationary, unheated solution however. I get the familiar "Failed to find a solution. Singular matrix" error. I've read that error can be caused by too coarse a mesh or a poor initial guess. There are plenty of nodes in this simple geometry, and the initial conditions are very close to the analytical solution. There must something obvious I am missing because I am a new user.
Would anyone be willing to look my very simple model (attached) and educate me? Thank you for your time.
-Andrew