I am doing a simulation of a tube. To reduce the calculation scale, I would like to simulate only a little portion of this tube by using periodical boundary condition. By this boundary condition, I want to link the inlet and the outlet of this small pipe.
But the problem is that I can't apply the inlet boundary condition . That's because the inlet boundary condition will be overridden by periodical boundary condition.
In order to solve the problem, I set the initial velocity as the same as the designed inlet velocity. However, since the wall is not a slip wall, the flow will come to a steady state when all the energy of flow is dissipated and the velocity becomes almost zero.
Is there anyone who can help me to solve this puzzle? Thank you!!!
But the problem is that I can't apply the inlet boundary condition . That's because the inlet boundary condition will be overridden by periodical boundary condition.
In order to solve the problem, I set the initial velocity as the same as the designed inlet velocity. However, since the wall is not a slip wall, the flow will come to a steady state when all the energy of flow is dissipated and the velocity becomes almost zero.
Is there anyone who can help me to solve this puzzle? Thank you!!!