![]() Probably the most commonly used downstream boundary condition in both steady and unsteady RAS is the Normal Depth assumption. I have verified that the 1D downstream XS matches the boundary of the 2D mesh and all manning's n values are equal.Copyright ©. ![]() The max WSEL in the 2D mesh matches the WSEL in the 1D model. However, when I run the model it appears that no flow is exiting the 1D model as the downstream water surface just continually raises until the "normal pool" elevation I established is reached. The model recognizes the connection and appears correct in the "Reach Connectivity" dialogue box in the geometry editor. I run into an error when I try to connect the 1D river reach to the 2D mesh. When I run the 1D model by itself it runs perfectly, and when I input the outflow hydrograph from the breach as a 2D boundary condition as a flow hydrograph the 2D mesh portion runs perfectly. \.\src\H5Oalloc.c line 1142 in H5O_alloc(): object header message is too largeĬhris - I am trying to complete a dam breach model of an up-ground reservoir that I am breaching within a 1D (dynamic breach) model which drains into my 2D mesh. \.\src\H5Omessage.c line 1945 in H5O_msg_alloc(): unable to allocate space for message ![]() \.\src\H5Omessage.c line 224 in H5O_msg_append_real(): unable to create new message \.\src\H5Oattribute.c line 347 in H5O_attr_create(): unable to create new attribute in header \.\src\H5A.c line 503 in H5A_create(): unable to create attribute in object header \.\src\H5A.c line 254 in H5Acreate2(): unable to create attribute HDF5-DIAG: Error detected in HDF5 (1.8.11) thread 0: Hello everyone, I was trying to simulate unsteady flow (Hydrologic Engineering Center, “HEC-RAS River Analysis System 2D Modeling User’s Manual Version 5.0”, Davis, CA. A 2D flow area is added by drawing a 2D flow area polygon developing the 2D computational mesh then linking the 2D flow areas to 1D model elements and/or directly connecting boundary conditions to the 2D areas.” To super critical and super critical to subcritical (hydraulic jumps).ĢD flow modeling is accomplished by adding 2D flow area elements into the model in the same manner as adding a storage area. The 2D capability (as well as the 1D) can handle supercritical and subcritical flow, as well as the flow transitions from subcritical
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