CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Increasing Inlet Flow Velocity Over Time

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 25, 2021, 15:26
Default Increasing Inlet Flow Velocity Over Time
  #1
New Member
 
n/a
Join Date: Sep 2020
Posts: 5
Rep Power: 4
williamsj0165 is on a distinguished road
Hello all, I have what should be a relatively simple question. I am simulating the flow over three cylinders to observe the vortex shedding. I am currently using a constant inlet velocity, but I would now like to increase the inlet velocity over time.

In 0/U, I currently have the code:

Code:
inlet
    {
        type            uniformFixedValue;
        uniformValue    constant (1 0 0);
    }

outlet 
    {
        type            pressureInletOutletVelocity;
        inletValue      uniform (1 0 0);
        value           uniform (1 0 0); 
    }

In order to increase the inlet velocity over time, I believe I will modify "inlet" as e.g.

Code:
inlet
    {
        type            uniformFixedValue;
        uniformValue    table
        (
            (0    (1 0 0))
            (5    (2 0 0))
            (10    (3 0 0))
        );
    }


My question is this – do I need to make a similar modification to outlet? It would just be this simple?

Code:
outlet 
    {
        type            pressureInletOutletVelocity;
        inletValue      table
        (
            (0    (1 0 0))
            (5    (2 0 0))
            (10    (3 0 0))
        );
    }
Thank you in advance for any comments or insights!

Last edited by williamsj0165; June 25, 2021 at 15:29. Reason: I have ended closing parentheses to the table values.
williamsj0165 is offline   Reply With Quote

Old   June 25, 2021, 16:23
Default Simulation Running
  #2
New Member
 
n/a
Join Date: Sep 2020
Posts: 5
Rep Power: 4
williamsj0165 is on a distinguished road
I have got the simulation running by modifying outlet as such:

Code:
    outlet 
    {
        type            pressureInletOutletVelocity;
        inletValue      table
        (
            (0    (1 0 0))
            (15    (2 0 0))
            (30    (3 0 0))
        );
        value           uniform (1 0 0); 
    }
This feels naive to me, so we'll see what the simulation looks like once it finishes.
williamsj0165 is offline   Reply With Quote

Reply

Tags
inlet, velocity

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Import .csv - velocity profile - error eSKa CFX 9 April 3, 2021 14:38
High Courant Number @ icoFoam Artex85 OpenFOAM Running, Solving & CFD 11 February 16, 2017 14:40
Floating point exception error lpz_michele OpenFOAM Running, Solving & CFD 53 October 19, 2015 03:50
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 10:11
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 06:13


All times are GMT -4. The time now is 10:14.