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constant desnity of a mixture

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Old   September 27, 2012, 03:26
Default constant desnity of a mixture
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kd
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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
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Old   September 28, 2012, 07:19
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ali
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Quote:
Originally Posted by cfd user View Post
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.
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Old   September 28, 2012, 08:10
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kd
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thank you, the problem is that i have no experience in writing such udf, maybe there is such prepared codes?
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Old   September 28, 2012, 18:04
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Originally Posted by cfd user View Post
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
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