[shillin.ks]

Dear friends, i am a post graduating student , doing my thesis work in acoustics.my problem is that i cannot input a time varying inlet velocity during my simulation of a Engine acoustics....any body please tell me how to input a time varying inlet velocity(ie, velocity having both amplitude and frequency v=v0*sin w*t) for incompressible,unsteady flow.......

[gschaider]

Originally Posted by shillin.ks

Dear friends, i am a post graduating student , doing my thesis work in acoustics.my problem is that i cannot input a time varying inlet velocity during my simulation of a Engine acoustics....any body please tell me how to input a time varying inlet velocity(ie, velocity having both amplitude and frequency v=v0*sin w*t) for incompressible,unsteady flow.......

Are you aware that this forum has a search function? Searching "time varying velocity" in the OpenFOAM-forums brings up a number of hits. One of them for instance http://www.cfd-online.com/Forums/ope...ch-normal.html (personally I would recommend you groovyBC)

[stevenvanharen]

Or use the 'bananas' tricks.

Replace a random boundary condition (like fixedValue) with the word 'bananas'. OpenFOAM will complain and say that this B.C. does not exist. It will give you a list of valid B.C.'s I think you will find something that you can use there.

Then browse to the source and tutorials to see how to use these b.c.'s.

[shillin.ks]

my problem is that to simulate muffler exhaust acoustics using open foam for this i dont know which foam i could use because to simulate the sound i should input a time varying velocity......so please give me the proper guideline....

[gschaider]

Originally Posted by shillin.ks

my problem is that to simulate muffler exhaust acoustics using open foam for this i dont know which foam i could use because to simulate the sound i should input a time varying velocity......so please give me the proper guideline....

Look for timeVaryingUniform or groovyBC. They have been explained a number of times here