Hello,
I am a beginning user of COMSOL.
Currently, I am trying to create a preliminary model of Marangoni convection, like this one available on the COMSOL site: www.comsol.com/model/marangoni-convection-110
The main difference is that mine is axisymmetric, rather than two-dimenional, and instead of a temperature difference, the fluid is heated with a point heat source on the upper, free surface.
I was planning on doing both a stationary and time dependent study, but both are running into errors.
The stationary study yields results, but for some reason, the heated spot is colder than the rest of the fluid, rather than hotter.
I can only take from this something is wrong.
The time dependent study always encounter errors. the most recent one was the following.
Repeated error test failures. May have reached a singularity.
Time : 5.445849929194077e-006
Undefined value found.
Undefined value found in the stiffness matrix.
There are 2 equations giving NaN/Inf in the matrix rows for the variable comp1.w. at coordinates: (0,0), (0.00512513,0), ...
and similarly for the degrees of freedom, NaN/Inf in the matrix columns.
Last time step is not converged.
Could someone help me get this right?
I've attached my model to this post.
With regards,
Aaron Ayal
I am a beginning user of COMSOL.
Currently, I am trying to create a preliminary model of Marangoni convection, like this one available on the COMSOL site: www.comsol.com/model/marangoni-convection-110
The main difference is that mine is axisymmetric, rather than two-dimenional, and instead of a temperature difference, the fluid is heated with a point heat source on the upper, free surface.
I was planning on doing both a stationary and time dependent study, but both are running into errors.
The stationary study yields results, but for some reason, the heated spot is colder than the rest of the fluid, rather than hotter.
I can only take from this something is wrong.
The time dependent study always encounter errors. the most recent one was the following.
Repeated error test failures. May have reached a singularity.
Time : 5.445849929194077e-006
Undefined value found.
Undefined value found in the stiffness matrix.
There are 2 equations giving NaN/Inf in the matrix rows for the variable comp1.w. at coordinates: (0,0), (0.00512513,0), ...
and similarly for the degrees of freedom, NaN/Inf in the matrix columns.
Last time step is not converged.
Could someone help me get this right?
I've attached my model to this post.
With regards,
Aaron Ayal