[cfd user]

hello people
i have a question about constant denisty of mixture.
i am tring to simulte mixture of hydrogen-air.
in materials tab when using a mixture, there is option in density to choose ideal gas, incompressible ideal gas and etc... there isn't option to choose constant denisty, there is option of user defind.
maybe somone know how to write udf of constand density, i suppose it's need to be simple.
thank

[fluent_engineer]

Originally Posted by cfd user

hello people
i have a question about constant denisty of mixture.
i am tring to simulte mixture of hydrogen-air.
in materials tab when using a mixture, there is option in density to choose ideal gas, incompressible ideal gas and etc... there isn't option to choose constant denisty, there is option of user defind.
maybe somone know how to write udf of constand density, i suppose it's need to be simple.
thank

hi
write a udf in which u describe changes of density with pressure ,and write a udf for describing speed of sound.

[cfd user]

thank you, the problem is that i have no experience in writing such udf, maybe there is such prepared codes?

[fluent_engineer]

Originally Posted by cfd user

thank you, the problem is that i have no experience in writing such udf, maybe there is such prepared codes?

yes
u should search
certainly there is similar code in internet or training books