I simulated a prosthetic heart valves in comsol and Faced with the following error in fsi ( fluid solid interaction)...
Undefined variable.- Variable: p_outlet
Geometry: geom1
Boundary: 26
I attach pictures
p_outlet is bondury condition and my study is time dependent...
Could you make a new picture like the first of the two, but showing more of the window, so that we can see the value you input. If you have a table with "something" dependent on frequency, and you want to plot these values in the Results, you would type "something(freq)". Here, you may have to type "p_inlet(t)".
As the description "undefined variable" explains, there is a boundary condition defined on that boundary "p_outlet". It is not a variable generated automatically by comsol as the name identifies rght?
What kind of boundary condition? did you defined an equation based function? and assigned it to that boundary?
often delete and reassign a net "study" helps also, when a variable lacks to compute.
Sometimes the boundary or chosen variables are not appropriate with your model or geometry. Try modify it.
Hi mr evren firat
Hi mr Fatihhi S.J
Thank you
I define my boundary conditions for the set of points which depends on time(fig 2)
Do interpolation sector needs to define the function? inlet pressure and outlet pressure is boundary conditions of problem..
How I define a set of points As the boundary conditions Which is time-dependent??
What is your suggestion for this study that I do not deal with this error????
Best regard...
Have u defined p outlet in variable? Function need to include the variable or parameter you choose to calculate
Hi,
I suggest that you perform a simulation with constant boundary conditions. and then you can use it in as initial condition for the next step simulation by implenting the original function based boundary condition.
You can define boundary conditions as a function depending on time by using the variable "t". Locating in boundary condition area ( user defined) and typing "p_outlet(t)" assigns a time dependent boundary condition. But be carefull with the initial condition. Which means in the beginning the function can be "0" which leads to convergence problems and you get no solutions. That's why I suggested at first performing a simulation with constant values and stepwise completing the modelling.
Best regards
Hi. In simulation I faced with this error:
Undefined variable.
- Variable: comp1.solid.u_tx
- Geometry: geom1
- Domains: 2-3, 19
Failed to evaluate Jacobian of expression.
can anyone help me?
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