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Load vector L is zero for both stationary and time dependent analysis

Nanda Kishore Bellam Muralidhar

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Dear all,

I am studying the numerical analysis of wave propagation in fiber metal laminates to detect damages. One of the prime tasks involve model-order reduction. For that, I am trying to extract the system matrices (K, E :- Stiffness and mass matrices) and load matrix (L) from COMSOL, subsequently reduce them using POD method in MATLAB. However, I am facing a hurdle in this process.

Problem/Hurdle:

The load vector is always a zero vector. Moreover, for a time-dependent analysis, when I use the following command in MATLAB:

str = mphmatrix(model, 'sol1', 'out', {'L'}, 15), to extract the load vector at 15th time-step, it is prompting me an error which reads: "Error using proputil. A property/value list must contain an even number of elements".

I then conducted a stationary analysis, and tried to extract the load vector. But again it was a zero vector.

Could someone help me to get through this?

Best regards, Nanda Kishore


0 Replies Last Post 2021年4月10日 GMT-4 08:39
COMSOL Moderator

Hello Nanda Kishore Bellam Muralidhar

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