Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Use a steady fluid velocity field solution as IC in an transient Multiphysics simulation
Posted 9 feb 2015, 10:35 GMT-5 Fluid & Heat, Chemical Reaction Engineering Version 4.3 1 Reply
Please login with a confirmed email address before reporting spam
Dear all,
I again have a simple question I think, but I cannot figure out the solution or maybe I just think it is more complicated, than it actually is.
I have the model problem described in the other discussion. So a cylinder in a tube at a fixed position and I have a steady-state velocity field of the fluid flowing in the tube. Subsequently I want to perform a transient study with fluid flow, transport of diluted species and moving mesh physics.
What I like to do now is, just using the steady-state flow field in the transient simulation as the initial condition for my flow field, but it doesnt work, because I can either choose to use a solution from a different solver as initial condition or use the initial conditions given in the study. I cannot set the initial conditions for the different variables independently, can I?
Is there any solution to my problem or is there now problem?
I again have a simple question I think, but I cannot figure out the solution or maybe I just think it is more complicated, than it actually is.
I have the model problem described in the other discussion. So a cylinder in a tube at a fixed position and I have a steady-state velocity field of the fluid flowing in the tube. Subsequently I want to perform a transient study with fluid flow, transport of diluted species and moving mesh physics.
What I like to do now is, just using the steady-state flow field in the transient simulation as the initial condition for my flow field, but it doesnt work, because I can either choose to use a solution from a different solver as initial condition or use the initial conditions given in the study. I cannot set the initial conditions for the different variables independently, can I?
Is there any solution to my problem or is there now problem?
1 Reply Last Post 10 feb 2015, 01:51 GMT-5
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
Hi
You already solved the problem by yourself. Solve first the flow field at steady-state, and then add a new time-dependent study where you use the flow field of the previous study as an initial value. Whether it accelerates the latter solver, I cannot say.
br
Lasse
You already solved the problem by yourself. Solve first the flow field at steady-state, and then add a new time-dependent study where you use the flow field of the previous study as an initial value. Whether it accelerates the latter solver, I cannot say.
br
Lasse