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Dynamic viscosity

Posted Dec 21, 2021, 1:36 p.m. EST General Version 5.5 1 Reply

Prakash Singh
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I am trying to add a blank solid material, but here it is asking for dynamic viscosity. what to do?

1 Reply Last Post Dec 22, 2021, 7:06 a.m. EST
Magnus Ringh COMSOL Employee

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Posted: 3 years ago Dec 22, 2021, 7:06 a.m. EST

Hi,

The Material nodes asks for the physical properties required by the physics interfaces that are active on the same domains (or boundaries). In this case, it seems that you have a fluid-flow interface in your model (which suggests that that domain is not a solid). If you change its setting for Dynamic viscosity in its Fluid Properties node's Settings window to User defined (from From material), the request for dynamic viscosity will disappear from the Material node, and you can enter a value or expression for the dynamic viscosity directly in the fluid-flow interface's Fluid Properties node.

Best regards,

Magnus

Hi, The **Material** nodes asks for the physical properties required by the physics interfaces that are active on the same domains (or boundaries). In this case, it seems that you have a fluid-flow interface in your model (which suggests that that domain is not a solid). If you change its setting for **Dynamic viscosity** in its **Fluid Properties** node's Settings window to **User defined** (from **From material**), the request for dynamic viscosity will disappear from the **Material** node, and you can enter a value or expression for the dynamic viscosity directly in the fluid-flow interface's **Fluid Properties** node. Best regards, Magnus

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